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Finding the Fourth Proportional to 128,756.88, 177,689.10 and 75,033.18

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Solution

The fourth proportional to 128,756.88, 177,689.10 and 75,033.18 is: 103,548.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,756.88 : 177,689.10 = 75,033.18 : x
  2. Step 2: Convert to fraction form
    128,756.88/177,689.10 = 75,033.18/x
  3. Step 3: Cross multiply
    128,756.88x = 177,689.10 × 75,033.18
  4. Step 4: Simplify right side
    128,756.88x = 13,332,578,224.34
  5. Step 5: Solve for x
    x = 13,332,578,224.34/128,756.88
  6. Step 6: Final answer
    x = 103,548.47

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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.