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Finding the Fourth Proportional to 1,123.93, 1,686.01 and 430.93

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Solution

The fourth proportional to 1,123.93, 1,686.01 and 430.93 is: 646.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.93 : 1,686.01 = 430.93 : x
  2. Step 2: Convert to fraction form
    1,123.93/1,686.01 = 430.93/x
  3. Step 3: Cross multiply
    1,123.93x = 1,686.01 × 430.93
  4. Step 4: Simplify right side
    1,123.93x = 726,552.29
  5. Step 5: Solve for x
    x = 726,552.29/1,123.93
  6. Step 6: Final answer
    x = 646.44

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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.