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Finding the Fourth Proportional to 748.47, 1,122.70 and 619.95

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Solution

The fourth proportional to 748.47, 1,122.70 and 619.95 is: 929.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.47 : 1,122.70 = 619.95 : x
  2. Step 2: Convert to fraction form
    748.47/1,122.70 = 619.95/x
  3. Step 3: Cross multiply
    748.47x = 1,122.70 × 619.95
  4. Step 4: Simplify right side
    748.47x = 696,017.87
  5. Step 5: Solve for x
    x = 696,017.87/748.47
  6. Step 6: Final answer
    x = 929.92

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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.