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Finding the Fourth Proportional to 289,103.80, 433,688.10 and 89,422.60

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Solution

The fourth proportional to 289,103.80, 433,688.10 and 89,422.60 is: 134,143.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,103.80 : 433,688.10 = 89,422.60 : x
  2. Step 2: Convert to fraction form
    289,103.80/433,688.10 = 89,422.60/x
  3. Step 3: Cross multiply
    289,103.80x = 433,688.10 × 89,422.60
  4. Step 4: Simplify right side
    289,103.80x = 38,781,517,491.06
  5. Step 5: Solve for x
    x = 38,781,517,491.06/289,103.80
  6. Step 6: Final answer
    x = 134,143.92

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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.