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Finding the Fourth Proportional to 60,480.80, 90,699.60 and 21,039.20

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Solution

The fourth proportional to 60,480.80, 90,699.60 and 21,039.20 is: 31,551.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,480.80 : 90,699.60 = 21,039.20 : x
  2. Step 2: Convert to fraction form
    60,480.80/90,699.60 = 21,039.20/x
  3. Step 3: Cross multiply
    60,480.80x = 90,699.60 × 21,039.20
  4. Step 4: Simplify right side
    60,480.80x = 1,908,247,024.32
  5. Step 5: Solve for x
    x = 1,908,247,024.32/60,480.80
  6. Step 6: Final answer
    x = 31,551.29

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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.