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Finding the Fourth Proportional to 128,019.96, 176,646.42 and 71,431.20

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Solution

The fourth proportional to 128,019.96, 176,646.42 and 71,431.20 is: 98,563.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,019.96 : 176,646.42 = 71,431.20 : x
  2. Step 2: Convert to fraction form
    128,019.96/176,646.42 = 71,431.20/x
  3. Step 3: Cross multiply
    128,019.96x = 176,646.42 × 71,431.20
  4. Step 4: Simplify right side
    128,019.96x = 12,618,065,756.30
  5. Step 5: Solve for x
    x = 12,618,065,756.30/128,019.96
  6. Step 6: Final answer
    x = 98,563.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.