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Finding the Fourth Proportional to 90,812.70, 135,959.85 and 80,444.70

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Solution

The fourth proportional to 90,812.70, 135,959.85 and 80,444.70 is: 120,437.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,812.70 : 135,959.85 = 80,444.70 : x
  2. Step 2: Convert to fraction form
    90,812.70/135,959.85 = 80,444.70/x
  3. Step 3: Cross multiply
    90,812.70x = 135,959.85 × 80,444.70
  4. Step 4: Simplify right side
    90,812.70x = 10,937,249,345.30
  5. Step 5: Solve for x
    x = 10,937,249,345.30/90,812.70
  6. Step 6: Final answer
    x = 120,437.44

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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.