Home / 257,690.61-386,572.38-80,215.56

Finding the Fourth Proportional to 257,690.61, 386,572.38 and 80,215.56

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Solution

The fourth proportional to 257,690.61, 386,572.38 and 80,215.56 is: 120,334.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,690.61 : 386,572.38 = 80,215.56 : x
  2. Step 2: Convert to fraction form
    257,690.61/386,572.38 = 80,215.56/x
  3. Step 3: Cross multiply
    257,690.61x = 386,572.38 × 80,215.56
  4. Step 4: Simplify right side
    257,690.61x = 31,009,119,942.23
  5. Step 5: Solve for x
    x = 31,009,119,942.23/257,690.61
  6. Step 6: Final answer
    x = 120,334.69

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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.