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Finding the Fourth Proportional to 89,870.40, 134,805.60 and 30,691.80

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Solution

The fourth proportional to 89,870.40, 134,805.60 and 30,691.80 is: 46,037.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,870.40 : 134,805.60 = 30,691.80 : x
  2. Step 2: Convert to fraction form
    89,870.40/134,805.60 = 30,691.80/x
  3. Step 3: Cross multiply
    89,870.40x = 134,805.60 × 30,691.80
  4. Step 4: Simplify right side
    89,870.40x = 4,137,426,514.08
  5. Step 5: Solve for x
    x = 4,137,426,514.08/89,870.40
  6. Step 6: Final answer
    x = 46,037.70

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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.