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Finding the Fourth Proportional to 781.44, 1,172.64 and 457.44

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Solution

The fourth proportional to 781.44, 1,172.64 and 457.44 is: 686.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.44 : 1,172.64 = 457.44 : x
  2. Step 2: Convert to fraction form
    781.44/1,172.64 = 457.44/x
  3. Step 3: Cross multiply
    781.44x = 1,172.64 × 457.44
  4. Step 4: Simplify right side
    781.44x = 536,412.44
  5. Step 5: Solve for x
    x = 536,412.44/781.44
  6. Step 6: Final answer
    x = 686.44

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1.5x scale

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.