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Finding the Fourth Proportional to 72,220.63, 99,669.27 and 40,387.63

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Solution

The fourth proportional to 72,220.63, 99,669.27 and 40,387.63 is: 55,737.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,220.63 : 99,669.27 = 40,387.63 : x
  2. Step 2: Convert to fraction form
    72,220.63/99,669.27 = 40,387.63/x
  3. Step 3: Cross multiply
    72,220.63x = 99,669.27 × 40,387.63
  4. Step 4: Simplify right side
    72,220.63x = 4,025,405,599.13
  5. Step 5: Solve for x
    x = 4,025,405,599.13/72,220.63
  6. Step 6: Final answer
    x = 55,737.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.