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Finding the Fourth Proportional to 853.47, 1,177.85 and 499.40

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Solution

The fourth proportional to 853.47, 1,177.85 and 499.40 is: 689.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.47 : 1,177.85 = 499.40 : x
  2. Step 2: Convert to fraction form
    853.47/1,177.85 = 499.40/x
  3. Step 3: Cross multiply
    853.47x = 1,177.85 × 499.40
  4. Step 4: Simplify right side
    853.47x = 588,218.74
  5. Step 5: Solve for x
    x = 588,218.74/853.47
  6. Step 6: Final answer
    x = 689.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.