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Finding the Fourth Proportional to 64,431.60, 89,000.78 and 53,711.49

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Solution

The fourth proportional to 64,431.60, 89,000.78 and 53,711.49 is: 74,192.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,431.60 : 89,000.78 = 53,711.49 : x
  2. Step 2: Convert to fraction form
    64,431.60/89,000.78 = 53,711.49/x
  3. Step 3: Cross multiply
    64,431.60x = 89,000.78 × 53,711.49
  4. Step 4: Simplify right side
    64,431.60x = 4,780,364,236.40
  5. Step 5: Solve for x
    x = 4,780,364,236.40/64,431.60
  6. Step 6: Final answer
    x = 74,192.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.