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Finding the Fourth Proportional to 90,003.90, 135,005.85 and 86,547.90

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Solution

The fourth proportional to 90,003.90, 135,005.85 and 86,547.90 is: 129,821.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,003.90 : 135,005.85 = 86,547.90 : x
  2. Step 2: Convert to fraction form
    90,003.90/135,005.85 = 86,547.90/x
  3. Step 3: Cross multiply
    90,003.90x = 135,005.85 × 86,547.90
  4. Step 4: Simplify right side
    90,003.90x = 11,684,472,805.22
  5. Step 5: Solve for x
    x = 11,684,472,805.22/90,003.90
  6. Step 6: Final answer
    x = 129,821.85

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1.5x scale

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.