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Finding the Fourth Proportional to 785.60, 1,178.40 and 353.12

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Solution

The fourth proportional to 785.60, 1,178.40 and 353.12 is: 529.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.60 : 1,178.40 = 353.12 : x
  2. Step 2: Convert to fraction form
    785.60/1,178.40 = 353.12/x
  3. Step 3: Cross multiply
    785.60x = 1,178.40 × 353.12
  4. Step 4: Simplify right side
    785.60x = 416,116.61
  5. Step 5: Solve for x
    x = 416,116.61/785.60
  6. Step 6: Final answer
    x = 529.68

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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.