Home / 85,421.40-128,132.10-84,109.20

Finding the Fourth Proportional to 85,421.40, 128,132.10 and 84,109.20

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Solution

The fourth proportional to 85,421.40, 128,132.10 and 84,109.20 is: 126,163.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,421.40 : 128,132.10 = 84,109.20 : x
  2. Step 2: Convert to fraction form
    85,421.40/128,132.10 = 84,109.20/x
  3. Step 3: Cross multiply
    85,421.40x = 128,132.10 × 84,109.20
  4. Step 4: Simplify right side
    85,421.40x = 10,777,088,425.32
  5. Step 5: Solve for x
    x = 10,777,088,425.32/85,421.40
  6. Step 6: Final answer
    x = 126,163.80

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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.