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Finding the Fourth Proportional to 918.76, 1,376.88 and 424.88

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Solution

The fourth proportional to 918.76, 1,376.88 and 424.88 is: 636.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.76 : 1,376.88 = 424.88 : x
  2. Step 2: Convert to fraction form
    918.76/1,376.88 = 424.88/x
  3. Step 3: Cross multiply
    918.76x = 1,376.88 × 424.88
  4. Step 4: Simplify right side
    918.76x = 585,008.77
  5. Step 5: Solve for x
    x = 585,008.77/918.76
  6. Step 6: Final answer
    x = 636.74

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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.