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Finding the Fourth Proportional to 707.40, 1,059.78 and 615

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Solution

The fourth proportional to 707.40, 1,059.78 and 615 is: 921.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.40 : 1,059.78 = 615 : x
  2. Step 2: Convert to fraction form
    707.40/1,059.78 = 615/x
  3. Step 3: Cross multiply
    707.40x = 1,059.78 × 615
  4. Step 4: Simplify right side
    707.40x = 651,764.70
  5. Step 5: Solve for x
    x = 651,764.70/707.40
  6. Step 6: Final answer
    x = 921.35

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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.