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Finding the Fourth Proportional to 747.75, 1,030.43 and 561.45

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Solution

The fourth proportional to 747.75, 1,030.43 and 561.45 is: 773.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.75 : 1,030.43 = 561.45 : x
  2. Step 2: Convert to fraction form
    747.75/1,030.43 = 561.45/x
  3. Step 3: Cross multiply
    747.75x = 1,030.43 × 561.45
  4. Step 4: Simplify right side
    747.75x = 578,534.92
  5. Step 5: Solve for x
    x = 578,534.92/747.75
  6. Step 6: Final answer
    x = 773.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.