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Finding the Fourth Proportional to 128,897.16, 177,899.45 and 75,182.17

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Solution

The fourth proportional to 128,897.16, 177,899.45 and 75,182.17 is: 103,763.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.16 : 177,899.45 = 75,182.17 : x
  2. Step 2: Convert to fraction form
    128,897.16/177,899.45 = 75,182.17/x
  3. Step 3: Cross multiply
    128,897.16x = 177,899.45 × 75,182.17
  4. Step 4: Simplify right side
    128,897.16x = 13,374,866,692.81
  5. Step 5: Solve for x
    x = 13,374,866,692.81/128,897.16
  6. Step 6: Final answer
    x = 103,763.86

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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.