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Finding the Fourth Proportional to 60,545.79, 90,769.49 and 21,130.59

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Solution

The fourth proportional to 60,545.79, 90,769.49 and 21,130.59 is: 31,678.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,545.79 : 90,769.49 = 21,130.59 : x
  2. Step 2: Convert to fraction form
    60,545.79/90,769.49 = 21,130.59/x
  3. Step 3: Cross multiply
    60,545.79x = 90,769.49 × 21,130.59
  4. Step 4: Simplify right side
    60,545.79x = 1,918,012,772.05
  5. Step 5: Solve for x
    x = 1,918,012,772.05/60,545.79
  6. Step 6: Final answer
    x = 31,678.71

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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.