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Finding the Fourth Proportional to 748.32, 1,123.70 and 619.53

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Solution

The fourth proportional to 748.32, 1,123.70 and 619.53 is: 930.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.32 : 1,123.70 = 619.53 : x
  2. Step 2: Convert to fraction form
    748.32/1,123.70 = 619.53/x
  3. Step 3: Cross multiply
    748.32x = 1,123.70 × 619.53
  4. Step 4: Simplify right side
    748.32x = 696,162.76
  5. Step 5: Solve for x
    x = 696,162.76/748.32
  6. Step 6: Final answer
    x = 930.30

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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.