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Finding the Fourth Proportional to 715.80, 1,073.08 and 426.63

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Solution

The fourth proportional to 715.80, 1,073.08 and 426.63 is: 639.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.80 : 1,073.08 = 426.63 : x
  2. Step 2: Convert to fraction form
    715.80/1,073.08 = 426.63/x
  3. Step 3: Cross multiply
    715.80x = 1,073.08 × 426.63
  4. Step 4: Simplify right side
    715.80x = 457,808.12
  5. Step 5: Solve for x
    x = 457,808.12/715.80
  6. Step 6: Final answer
    x = 639.58

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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.