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Finding the Fourth Proportional to 1,123.94, 1,686.44 and 430.38

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Solution

The fourth proportional to 1,123.94, 1,686.44 and 430.38 is: 645.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.94 : 1,686.44 = 430.38 : x
  2. Step 2: Convert to fraction form
    1,123.94/1,686.44 = 430.38/x
  3. Step 3: Cross multiply
    1,123.94x = 1,686.44 × 430.38
  4. Step 4: Simplify right side
    1,123.94x = 725,807.90
  5. Step 5: Solve for x
    x = 725,807.90/1,123.94
  6. Step 6: Final answer
    x = 645.77

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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.