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Finding the Fourth Proportional to 871.52, 1,307.95 and 384.91

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Solution

The fourth proportional to 871.52, 1,307.95 and 384.91 is: 577.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.52 : 1,307.95 = 384.91 : x
  2. Step 2: Convert to fraction form
    871.52/1,307.95 = 384.91/x
  3. Step 3: Cross multiply
    871.52x = 1,307.95 × 384.91
  4. Step 4: Simplify right side
    871.52x = 503,438.80
  5. Step 5: Solve for x
    x = 503,438.80/871.52
  6. Step 6: Final answer
    x = 577.66

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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.