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Finding the Fourth Proportional to 85,013.70, 127,515.15 and 28,853.70

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Solution

The fourth proportional to 85,013.70, 127,515.15 and 28,853.70 is: 43,278.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,013.70 : 127,515.15 = 28,853.70 : x
  2. Step 2: Convert to fraction form
    85,013.70/127,515.15 = 28,853.70/x
  3. Step 3: Cross multiply
    85,013.70x = 127,515.15 × 28,853.70
  4. Step 4: Simplify right side
    85,013.70x = 3,679,283,883.56
  5. Step 5: Solve for x
    x = 3,679,283,883.56/85,013.70
  6. Step 6: Final answer
    x = 43,278.72

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1.5x scale

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.