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Finding the Fourth Proportional to 853.79, 1,280.59 and 502.61

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Solution

The fourth proportional to 853.79, 1,280.59 and 502.61 is: 753.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.79 : 1,280.59 = 502.61 : x
  2. Step 2: Convert to fraction form
    853.79/1,280.59 = 502.61/x
  3. Step 3: Cross multiply
    853.79x = 1,280.59 × 502.61
  4. Step 4: Simplify right side
    853.79x = 643,634.14
  5. Step 5: Solve for x
    x = 643,634.14/853.79
  6. Step 6: Final answer
    x = 753.85

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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.