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Finding the Fourth Proportional to 751.71, 1,124.31 and 615.63

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Solution

The fourth proportional to 751.71, 1,124.31 and 615.63 is: 920.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.71 : 1,124.31 = 615.63 : x
  2. Step 2: Convert to fraction form
    751.71/1,124.31 = 615.63/x
  3. Step 3: Cross multiply
    751.71x = 1,124.31 × 615.63
  4. Step 4: Simplify right side
    751.71x = 692,158.97
  5. Step 5: Solve for x
    x = 692,158.97/751.71
  6. Step 6: Final answer
    x = 920.78

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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.