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Finding the Fourth Proportional to 1,124.31, 1,685.88 and 430.77

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Solution

The fourth proportional to 1,124.31, 1,685.88 and 430.77 is: 645.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.31 : 1,685.88 = 430.77 : x
  2. Step 2: Convert to fraction form
    1,124.31/1,685.88 = 430.77/x
  3. Step 3: Cross multiply
    1,124.31x = 1,685.88 × 430.77
  4. Step 4: Simplify right side
    1,124.31x = 726,226.53
  5. Step 5: Solve for x
    x = 726,226.53/1,124.31
  6. Step 6: Final answer
    x = 645.93

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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.