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Finding the Fourth Proportional to 772.35, 1,158.53 and 425.62

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Solution

The fourth proportional to 772.35, 1,158.53 and 425.62 is: 638.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.35 : 1,158.53 = 425.62 : x
  2. Step 2: Convert to fraction form
    772.35/1,158.53 = 425.62/x
  3. Step 3: Cross multiply
    772.35x = 1,158.53 × 425.62
  4. Step 4: Simplify right side
    772.35x = 493,089.93
  5. Step 5: Solve for x
    x = 493,089.93/772.35
  6. Step 6: Final answer
    x = 638.43

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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.