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Finding the Fourth Proportional to 89,438.40, 133,963.20 and 54,316.80

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Solution

The fourth proportional to 89,438.40, 133,963.20 and 54,316.80 is: 81,357.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,438.40 : 133,963.20 = 54,316.80 : x
  2. Step 2: Convert to fraction form
    89,438.40/133,963.20 = 54,316.80/x
  3. Step 3: Cross multiply
    89,438.40x = 133,963.20 × 54,316.80
  4. Step 4: Simplify right side
    89,438.40x = 7,276,452,341.76
  5. Step 5: Solve for x
    x = 7,276,452,341.76/89,438.40
  6. Step 6: Final answer
    x = 81,357.14

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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.