Home / 1,985.19-2,740.85-1,240.18

Finding the Fourth Proportional to 1,985.19, 2,740.85 and 1,240.18

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Solution

The fourth proportional to 1,985.19, 2,740.85 and 1,240.18 is: 1,712.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.19 : 2,740.85 = 1,240.18 : x
  2. Step 2: Convert to fraction form
    1,985.19/2,740.85 = 1,240.18/x
  3. Step 3: Cross multiply
    1,985.19x = 2,740.85 × 1,240.18
  4. Step 4: Simplify right side
    1,985.19x = 3,399,147.35
  5. Step 5: Solve for x
    x = 3,399,147.35/1,985.19
  6. Step 6: Final answer
    x = 1,712.25

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Half scale
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Double scale
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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.