Home / 128,437.20-177,248.76-79,389.72

Finding the Fourth Proportional to 128,437.20, 177,248.76 and 79,389.72

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Solution

The fourth proportional to 128,437.20, 177,248.76 and 79,389.72 is: 109,561.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,437.20 : 177,248.76 = 79,389.72 : x
  2. Step 2: Convert to fraction form
    128,437.20/177,248.76 = 79,389.72/x
  3. Step 3: Cross multiply
    128,437.20x = 177,248.76 × 79,389.72
  4. Step 4: Simplify right side
    128,437.20x = 14,071,729,426.75
  5. Step 5: Solve for x
    x = 14,071,729,426.75/128,437.20
  6. Step 6: Final answer
    x = 109,561.17

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1.5x scale

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.