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Finding the Fourth Proportional to 872.30, 1,307.88 and 384.92

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Solution

The fourth proportional to 872.30, 1,307.88 and 384.92 is: 577.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.30 : 1,307.88 = 384.92 : x
  2. Step 2: Convert to fraction form
    872.30/1,307.88 = 384.92/x
  3. Step 3: Cross multiply
    872.30x = 1,307.88 × 384.92
  4. Step 4: Simplify right side
    872.30x = 503,429.17
  5. Step 5: Solve for x
    x = 503,429.17/872.30
  6. Step 6: Final answer
    x = 577.13

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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.