Home / 257,721.12-386,637.20-77,791.47

Finding the Fourth Proportional to 257,721.12, 386,637.20 and 77,791.47

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Solution

The fourth proportional to 257,721.12, 386,637.20 and 77,791.47 is: 116,703.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,721.12 : 386,637.20 = 77,791.47 : x
  2. Step 2: Convert to fraction form
    257,721.12/386,637.20 = 77,791.47/x
  3. Step 3: Cross multiply
    257,721.12x = 386,637.20 × 77,791.47
  4. Step 4: Simplify right side
    257,721.12x = 30,077,075,755.73
  5. Step 5: Solve for x
    x = 30,077,075,755.73/257,721.12
  6. Step 6: Final answer
    x = 116,703.96

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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.