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Finding the Fourth Proportional to 832.80, 1,248.36 and 312.72

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Solution

The fourth proportional to 832.80, 1,248.36 and 312.72 is: 468.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.80 : 1,248.36 = 312.72 : x
  2. Step 2: Convert to fraction form
    832.80/1,248.36 = 312.72/x
  3. Step 3: Cross multiply
    832.80x = 1,248.36 × 312.72
  4. Step 4: Simplify right side
    832.80x = 390,387.14
  5. Step 5: Solve for x
    x = 390,387.14/832.80
  6. Step 6: Final answer
    x = 468.76

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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.