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Finding the Fourth Proportional to 781.68, 1,171.98 and 493.32

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Solution

The fourth proportional to 781.68, 1,171.98 and 493.32 is: 739.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.68 : 1,171.98 = 493.32 : x
  2. Step 2: Convert to fraction form
    781.68/1,171.98 = 493.32/x
  3. Step 3: Cross multiply
    781.68x = 1,171.98 × 493.32
  4. Step 4: Simplify right side
    781.68x = 578,161.17
  5. Step 5: Solve for x
    x = 578,161.17/781.68
  6. Step 6: Final answer
    x = 739.64

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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.