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Finding the Fourth Proportional to 1,123.86, 1,685.81 and 430.85

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Solution

The fourth proportional to 1,123.86, 1,685.81 and 430.85 is: 646.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.86 : 1,685.81 = 430.85 : x
  2. Step 2: Convert to fraction form
    1,123.86/1,685.81 = 430.85/x
  3. Step 3: Cross multiply
    1,123.86x = 1,685.81 × 430.85
  4. Step 4: Simplify right side
    1,123.86x = 726,331.24
  5. Step 5: Solve for x
    x = 726,331.24/1,123.86
  6. Step 6: Final answer
    x = 646.28

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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.