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Finding the Fourth Proportional to 259,669.80, 389,475.90 and 72,700.20

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Solution

The fourth proportional to 259,669.80, 389,475.90 and 72,700.20 is: 109,042.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,669.80 : 389,475.90 = 72,700.20 : x
  2. Step 2: Convert to fraction form
    259,669.80/389,475.90 = 72,700.20/x
  3. Step 3: Cross multiply
    259,669.80x = 389,475.90 × 72,700.20
  4. Step 4: Simplify right side
    259,669.80x = 28,314,975,825.18
  5. Step 5: Solve for x
    x = 28,314,975,825.18/259,669.80
  6. Step 6: Final answer
    x = 109,042.24

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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.