Home / 72,203.40-99,641.28-39,942.72

Finding the Fourth Proportional to 72,203.40, 99,641.28 and 39,942.72

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Solution

The fourth proportional to 72,203.40, 99,641.28 and 39,942.72 is: 55,121.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,203.40 : 99,641.28 = 39,942.72 : x
  2. Step 2: Convert to fraction form
    72,203.40/99,641.28 = 39,942.72/x
  3. Step 3: Cross multiply
    72,203.40x = 99,641.28 × 39,942.72
  4. Step 4: Simplify right side
    72,203.40x = 3,979,943,747.48
  5. Step 5: Solve for x
    x = 3,979,943,747.48/72,203.40
  6. Step 6: Final answer
    x = 55,121.28

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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.