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Finding the Fourth Proportional to 60,666.60, 90,999.90 and 21,219.60

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Solution

The fourth proportional to 60,666.60, 90,999.90 and 21,219.60 is: 31,829.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,666.60 : 90,999.90 = 21,219.60 : x
  2. Step 2: Convert to fraction form
    60,666.60/90,999.90 = 21,219.60/x
  3. Step 3: Cross multiply
    60,666.60x = 90,999.90 × 21,219.60
  4. Step 4: Simplify right side
    60,666.60x = 1,930,981,478.04
  5. Step 5: Solve for x
    x = 1,930,981,478.04/60,666.60
  6. Step 6: Final answer
    x = 31,829.40

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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.