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Finding the Fourth Proportional to 72,593.42, 108,870.48 and 19,990.40

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Solution

The fourth proportional to 72,593.42, 108,870.48 and 19,990.40 is: 29,980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,593.42 : 108,870.48 = 19,990.40 : x
  2. Step 2: Convert to fraction form
    72,593.42/108,870.48 = 19,990.40/x
  3. Step 3: Cross multiply
    72,593.42x = 108,870.48 × 19,990.40
  4. Step 4: Simplify right side
    72,593.42x = 2,176,363,899.04
  5. Step 5: Solve for x
    x = 2,176,363,899.04/72,593.42
  6. Step 6: Final answer
    x = 29,980.18

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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.