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Finding the Fourth Proportional to 772.47, 1,159.20 and 285.48

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Solution

The fourth proportional to 772.47, 1,159.20 and 285.48 is: 428.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.47 : 1,159.20 = 285.48 : x
  2. Step 2: Convert to fraction form
    772.47/1,159.20 = 285.48/x
  3. Step 3: Cross multiply
    772.47x = 1,159.20 × 285.48
  4. Step 4: Simplify right side
    772.47x = 330,928.42
  5. Step 5: Solve for x
    x = 330,928.42/772.47
  6. Step 6: Final answer
    x = 428.40

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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.