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Finding the Fourth Proportional to 1,129.48, 1,693.74 and 399.16

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Solution

The fourth proportional to 1,129.48, 1,693.74 and 399.16 is: 598.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.48 : 1,693.74 = 399.16 : x
  2. Step 2: Convert to fraction form
    1,129.48/1,693.74 = 399.16/x
  3. Step 3: Cross multiply
    1,129.48x = 1,693.74 × 399.16
  4. Step 4: Simplify right side
    1,129.48x = 676,073.26
  5. Step 5: Solve for x
    x = 676,073.26/1,129.48
  6. Step 6: Final answer
    x = 598.57

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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.