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Finding the Fourth Proportional to 85,689.20, 118,249.80 and 47,964.80

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Solution

The fourth proportional to 85,689.20, 118,249.80 and 47,964.80 is: 66,190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,689.20 : 118,249.80 = 47,964.80 : x
  2. Step 2: Convert to fraction form
    85,689.20/118,249.80 = 47,964.80/x
  3. Step 3: Cross multiply
    85,689.20x = 118,249.80 × 47,964.80
  4. Step 4: Simplify right side
    85,689.20x = 5,671,828,007.04
  5. Step 5: Solve for x
    x = 5,671,828,007.04/85,689.20
  6. Step 6: Final answer
    x = 66,190.70

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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.