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Finding the Fourth Proportional to 917.50, 1,372.80 and 644.13

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Solution

The fourth proportional to 917.50, 1,372.80 and 644.13 is: 963.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.50 : 1,372.80 = 644.13 : x
  2. Step 2: Convert to fraction form
    917.50/1,372.80 = 644.13/x
  3. Step 3: Cross multiply
    917.50x = 1,372.80 × 644.13
  4. Step 4: Simplify right side
    917.50x = 884,261.66
  5. Step 5: Solve for x
    x = 884,261.66/917.50
  6. Step 6: Final answer
    x = 963.77

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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.