Home / 1,087.42-1,631.31-394.13

Finding the Fourth Proportional to 1,087.42, 1,631.31 and 394.13

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Solution

The fourth proportional to 1,087.42, 1,631.31 and 394.13 is: 591.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.42 : 1,631.31 = 394.13 : x
  2. Step 2: Convert to fraction form
    1,087.42/1,631.31 = 394.13/x
  3. Step 3: Cross multiply
    1,087.42x = 1,631.31 × 394.13
  4. Step 4: Simplify right side
    1,087.42x = 642,948.21
  5. Step 5: Solve for x
    x = 642,948.21/1,087.42
  6. Step 6: Final answer
    x = 591.26

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.