Home / 85,864.32-128,744.10-38,470.68

Finding the Fourth Proportional to 85,864.32, 128,744.10 and 38,470.68

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Solution

The fourth proportional to 85,864.32, 128,744.10 and 38,470.68 is: 57,682.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,864.32 : 128,744.10 = 38,470.68 : x
  2. Step 2: Convert to fraction form
    85,864.32/128,744.10 = 38,470.68/x
  3. Step 3: Cross multiply
    85,864.32x = 128,744.10 × 38,470.68
  4. Step 4: Simplify right side
    85,864.32x = 4,952,873,072.99
  5. Step 5: Solve for x
    x = 4,952,873,072.99/85,864.32
  6. Step 6: Final answer
    x = 57,682.55

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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.