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Finding the Fourth Proportional to 85,421.80, 128,132.70 and 43,431.40

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Solution

The fourth proportional to 85,421.80, 128,132.70 and 43,431.40 is: 65,147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,421.80 : 128,132.70 = 43,431.40 : x
  2. Step 2: Convert to fraction form
    85,421.80/128,132.70 = 43,431.40/x
  3. Step 3: Cross multiply
    85,421.80x = 128,132.70 × 43,431.40
  4. Step 4: Simplify right side
    85,421.80x = 5,564,982,546.78
  5. Step 5: Solve for x
    x = 5,564,982,546.78/85,421.80
  6. Step 6: Final answer
    x = 65,147.10

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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.