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Finding the Fourth Proportional to 747.41, 1,030.79 and 561.31

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Solution

The fourth proportional to 747.41, 1,030.79 and 561.31 is: 774.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.41 : 1,030.79 = 561.31 : x
  2. Step 2: Convert to fraction form
    747.41/1,030.79 = 561.31/x
  3. Step 3: Cross multiply
    747.41x = 1,030.79 × 561.31
  4. Step 4: Simplify right side
    747.41x = 578,591.56
  5. Step 5: Solve for x
    x = 578,591.56/747.41
  6. Step 6: Final answer
    x = 774.13

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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.