Home / 1,511.46-2,085.55-987.19

Finding the Fourth Proportional to 1,511.46, 2,085.55 and 987.19

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Solution

The fourth proportional to 1,511.46, 2,085.55 and 987.19 is: 1,362.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.46 : 2,085.55 = 987.19 : x
  2. Step 2: Convert to fraction form
    1,511.46/2,085.55 = 987.19/x
  3. Step 3: Cross multiply
    1,511.46x = 2,085.55 × 987.19
  4. Step 4: Simplify right side
    1,511.46x = 2,058,826.42
  5. Step 5: Solve for x
    x = 2,058,826.42/1,511.46
  6. Step 6: Final answer
    x = 1,362.14

Related Problems

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Half scale
Find fourth proportional to 3,022.92, 4,171.10 and 1,974.38
Double scale
Find fourth proportional to 1,512.46, 2,086.93 and 988.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.