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Finding the Fourth Proportional to 750.68, 1,123.28 and 442.68

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Solution

The fourth proportional to 750.68, 1,123.28 and 442.68 is: 662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.68 : 1,123.28 = 442.68 : x
  2. Step 2: Convert to fraction form
    750.68/1,123.28 = 442.68/x
  3. Step 3: Cross multiply
    750.68x = 1,123.28 × 442.68
  4. Step 4: Simplify right side
    750.68x = 497,253.59
  5. Step 5: Solve for x
    x = 497,253.59/750.68
  6. Step 6: Final answer
    x = 662.40

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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.