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Finding the Fourth Proportional to 85,419.70, 128,129.57 and 23,090.20

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Solution

The fourth proportional to 85,419.70, 128,129.57 and 23,090.20 is: 34,635.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,419.70 : 128,129.57 = 23,090.20 : x
  2. Step 2: Convert to fraction form
    85,419.70/128,129.57 = 23,090.20/x
  3. Step 3: Cross multiply
    85,419.70x = 128,129.57 × 23,090.20
  4. Step 4: Simplify right side
    85,419.70x = 2,958,537,397.21
  5. Step 5: Solve for x
    x = 2,958,537,397.21/85,419.70
  6. Step 6: Final answer
    x = 34,635.31

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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.