Home / 128,315.67-177,077.39-77,381.52

Finding the Fourth Proportional to 128,315.67, 177,077.39 and 77,381.52

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Solution

The fourth proportional to 128,315.67, 177,077.39 and 77,381.52 is: 106,787.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,315.67 : 177,077.39 = 77,381.52 : x
  2. Step 2: Convert to fraction form
    128,315.67/177,077.39 = 77,381.52/x
  3. Step 3: Cross multiply
    128,315.67x = 177,077.39 × 77,381.52
  4. Step 4: Simplify right side
    128,315.67x = 13,702,517,208.93
  5. Step 5: Solve for x
    x = 13,702,517,208.93/128,315.67
  6. Step 6: Final answer
    x = 106,787.56

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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.