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Finding the Fourth Proportional to 60,439.91, 90,657.09 and 21,000.11

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Solution

The fourth proportional to 60,439.91, 90,657.09 and 21,000.11 is: 31,499.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,439.91 : 90,657.09 = 21,000.11 : x
  2. Step 2: Convert to fraction form
    60,439.91/90,657.09 = 21,000.11/x
  3. Step 3: Cross multiply
    60,439.91x = 90,657.09 × 21,000.11
  4. Step 4: Simplify right side
    60,439.91x = 1,903,808,408.99
  5. Step 5: Solve for x
    x = 1,903,808,408.99/60,439.91
  6. Step 6: Final answer
    x = 31,499.20

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Double scale
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Similar ratio
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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.