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Finding the Fourth Proportional to 60,543.70, 90,830.13 and 18,990.70

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Solution

The fourth proportional to 60,543.70, 90,830.13 and 18,990.70 is: 28,490.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,543.70 : 90,830.13 = 18,990.70 : x
  2. Step 2: Convert to fraction form
    60,543.70/90,830.13 = 18,990.70/x
  3. Step 3: Cross multiply
    60,543.70x = 90,830.13 × 18,990.70
  4. Step 4: Simplify right side
    60,543.70x = 1,724,928,122.65
  5. Step 5: Solve for x
    x = 1,724,928,122.65/60,543.70
  6. Step 6: Final answer
    x = 28,490.63

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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.