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Finding the Fourth Proportional to 917.17, 1,374.17 and 642.74

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Solution

The fourth proportional to 917.17, 1,374.17 and 642.74 is: 962.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.17 : 1,374.17 = 642.74 : x
  2. Step 2: Convert to fraction form
    917.17/1,374.17 = 642.74/x
  3. Step 3: Cross multiply
    917.17x = 1,374.17 × 642.74
  4. Step 4: Simplify right side
    917.17x = 883,223.94
  5. Step 5: Solve for x
    x = 883,223.94/917.17
  6. Step 6: Final answer
    x = 962.98

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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.