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Finding the Fourth Proportional to 917.76, 1,376.64 and 532.80

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Solution

The fourth proportional to 917.76, 1,376.64 and 532.80 is: 799.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,376.64 = 532.80 : x
  2. Step 2: Convert to fraction form
    917.76/1,376.64 = 532.80/x
  3. Step 3: Cross multiply
    917.76x = 1,376.64 × 532.80
  4. Step 4: Simplify right side
    917.76x = 733,473.79
  5. Step 5: Solve for x
    x = 733,473.79/917.76
  6. Step 6: Final answer
    x = 799.20

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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.