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Finding the Fourth Proportional to 784.60, 1,176.02 and 460.20

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Solution

The fourth proportional to 784.60, 1,176.02 and 460.20 is: 689.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.60 : 1,176.02 = 460.20 : x
  2. Step 2: Convert to fraction form
    784.60/1,176.02 = 460.20/x
  3. Step 3: Cross multiply
    784.60x = 1,176.02 × 460.20
  4. Step 4: Simplify right side
    784.60x = 541,204.40
  5. Step 5: Solve for x
    x = 541,204.40/784.60
  6. Step 6: Final answer
    x = 689.78

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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.