Home / 128,929.81-177,920.32-71,565.76

Finding the Fourth Proportional to 128,929.81, 177,920.32 and 71,565.76

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Solution

The fourth proportional to 128,929.81, 177,920.32 and 71,565.76 is: 98,759.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,929.81 : 177,920.32 = 71,565.76 : x
  2. Step 2: Convert to fraction form
    128,929.81/177,920.32 = 71,565.76/x
  3. Step 3: Cross multiply
    128,929.81x = 177,920.32 × 71,565.76
  4. Step 4: Simplify right side
    128,929.81x = 12,733,002,920.24
  5. Step 5: Solve for x
    x = 12,733,002,920.24/128,929.81
  6. Step 6: Final answer
    x = 98,759.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.