Home / 128,115.20-176,790.20-77,118.01

Finding the Fourth Proportional to 128,115.20, 176,790.20 and 77,118.01

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Solution

The fourth proportional to 128,115.20, 176,790.20 and 77,118.01 is: 106,417.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,115.20 : 176,790.20 = 77,118.01 : x
  2. Step 2: Convert to fraction form
    128,115.20/176,790.20 = 77,118.01/x
  3. Step 3: Cross multiply
    128,115.20x = 176,790.20 × 77,118.01
  4. Step 4: Simplify right side
    128,115.20x = 13,633,707,583.94
  5. Step 5: Solve for x
    x = 13,633,707,583.94/128,115.20
  6. Step 6: Final answer
    x = 106,417.56

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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.