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Finding the Fourth Proportional to 85,398.62, 128,176.05 and 43,307.75

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Solution

The fourth proportional to 85,398.62, 128,176.05 and 43,307.75 is: 65,001.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,398.62 : 128,176.05 = 43,307.75 : x
  2. Step 2: Convert to fraction form
    85,398.62/128,176.05 = 43,307.75/x
  3. Step 3: Cross multiply
    85,398.62x = 128,176.05 × 43,307.75
  4. Step 4: Simplify right side
    85,398.62x = 5,551,016,329.39
  5. Step 5: Solve for x
    x = 5,551,016,329.39/85,398.62
  6. Step 6: Final answer
    x = 65,001.24

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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.