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Finding the Fourth Proportional to 917.76, 1,376.72 and 424.16

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Solution

The fourth proportional to 917.76, 1,376.72 and 424.16 is: 636.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,376.72 = 424.16 : x
  2. Step 2: Convert to fraction form
    917.76/1,376.72 = 424.16/x
  3. Step 3: Cross multiply
    917.76x = 1,376.72 × 424.16
  4. Step 4: Simplify right side
    917.76x = 583,949.56
  5. Step 5: Solve for x
    x = 583,949.56/917.76
  6. Step 6: Final answer
    x = 636.28

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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.