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Finding the Fourth Proportional to 1,129.39, 1,693.47 and 479.77

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Solution

The fourth proportional to 1,129.39, 1,693.47 and 479.77 is: 719.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.39 : 1,693.47 = 479.77 : x
  2. Step 2: Convert to fraction form
    1,129.39/1,693.47 = 479.77/x
  3. Step 3: Cross multiply
    1,129.39x = 1,693.47 × 479.77
  4. Step 4: Simplify right side
    1,129.39x = 812,476.10
  5. Step 5: Solve for x
    x = 812,476.10/1,129.39
  6. Step 6: Final answer
    x = 719.39

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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.