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Finding the Fourth Proportional to 86,170.70, 128,575.14 and 74,506.70

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Solution

The fourth proportional to 86,170.70, 128,575.14 and 74,506.70 is: 111,171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,170.70 : 128,575.14 = 74,506.70 : x
  2. Step 2: Convert to fraction form
    86,170.70/128,575.14 = 74,506.70/x
  3. Step 3: Cross multiply
    86,170.70x = 128,575.14 × 74,506.70
  4. Step 4: Simplify right side
    86,170.70x = 9,579,709,010.90
  5. Step 5: Solve for x
    x = 9,579,709,010.90/86,170.70
  6. Step 6: Final answer
    x = 111,171.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.