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Finding the Fourth Proportional to 85,780.80, 128,672.16 and 35,868.48

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Solution

The fourth proportional to 85,780.80, 128,672.16 and 35,868.48 is: 53,803.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,780.80 : 128,672.16 = 35,868.48 : x
  2. Step 2: Convert to fraction form
    85,780.80/128,672.16 = 35,868.48/x
  3. Step 3: Cross multiply
    85,780.80x = 128,672.16 × 35,868.48
  4. Step 4: Simplify right side
    85,780.80x = 4,615,274,797.52
  5. Step 5: Solve for x
    x = 4,615,274,797.52/85,780.80
  6. Step 6: Final answer
    x = 53,803.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.