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Finding the Fourth Proportional to 85,508.16, 117,990.72 and 47,781.60

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Solution

The fourth proportional to 85,508.16, 117,990.72 and 47,781.60 is: 65,932.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,508.16 : 117,990.72 = 47,781.60 : x
  2. Step 2: Convert to fraction form
    85,508.16/117,990.72 = 47,781.60/x
  3. Step 3: Cross multiply
    85,508.16x = 117,990.72 × 47,781.60
  4. Step 4: Simplify right side
    85,508.16x = 5,637,785,386.75
  5. Step 5: Solve for x
    x = 5,637,785,386.75/85,508.16
  6. Step 6: Final answer
    x = 65,932.72

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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.