Home / 1,511.19-2,085.55-921.65

Finding the Fourth Proportional to 1,511.19, 2,085.55 and 921.65

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Solution

The fourth proportional to 1,511.19, 2,085.55 and 921.65 is: 1,271.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.19 : 2,085.55 = 921.65 : x
  2. Step 2: Convert to fraction form
    1,511.19/2,085.55 = 921.65/x
  3. Step 3: Cross multiply
    1,511.19x = 2,085.55 × 921.65
  4. Step 4: Simplify right side
    1,511.19x = 1,922,134.43
  5. Step 5: Solve for x
    x = 1,922,134.43/1,511.19
  6. Step 6: Final answer
    x = 1,271.93

Related Problems

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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.