Home / 85,427.40-128,141.10-84,115.20

Finding the Fourth Proportional to 85,427.40, 128,141.10 and 84,115.20

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Solution

The fourth proportional to 85,427.40, 128,141.10 and 84,115.20 is: 126,172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,427.40 : 128,141.10 = 84,115.20 : x
  2. Step 2: Convert to fraction form
    85,427.40/128,141.10 = 84,115.20/x
  3. Step 3: Cross multiply
    85,427.40x = 128,141.10 × 84,115.20
  4. Step 4: Simplify right side
    85,427.40x = 10,778,614,254.72
  5. Step 5: Solve for x
    x = 10,778,614,254.72/85,427.40
  6. Step 6: Final answer
    x = 126,172.80

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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.