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Finding the Fourth Proportional to 839.72, 1,158.72 and 503.60

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Solution

The fourth proportional to 839.72, 1,158.72 and 503.60 is: 694.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.72 : 1,158.72 = 503.60 : x
  2. Step 2: Convert to fraction form
    839.72/1,158.72 = 503.60/x
  3. Step 3: Cross multiply
    839.72x = 1,158.72 × 503.60
  4. Step 4: Simplify right side
    839.72x = 583,531.39
  5. Step 5: Solve for x
    x = 583,531.39/839.72
  6. Step 6: Final answer
    x = 694.91

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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.