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Finding the Fourth Proportional to 708.28, 1,056.71 and 617.15

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Solution

The fourth proportional to 708.28, 1,056.71 and 617.15 is: 920.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.28 : 1,056.71 = 617.15 : x
  2. Step 2: Convert to fraction form
    708.28/1,056.71 = 617.15/x
  3. Step 3: Cross multiply
    708.28x = 1,056.71 × 617.15
  4. Step 4: Simplify right side
    708.28x = 652,152.76
  5. Step 5: Solve for x
    x = 652,152.76/708.28
  6. Step 6: Final answer
    x = 920.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.