Home / 84,821.40-127,232.10-78,406.20

Finding the Fourth Proportional to 84,821.40, 127,232.10 and 78,406.20

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Solution

The fourth proportional to 84,821.40, 127,232.10 and 78,406.20 is: 117,609.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,821.40 : 127,232.10 = 78,406.20 : x
  2. Step 2: Convert to fraction form
    84,821.40/127,232.10 = 78,406.20/x
  3. Step 3: Cross multiply
    84,821.40x = 127,232.10 × 78,406.20
  4. Step 4: Simplify right side
    84,821.40x = 9,975,785,479.02
  5. Step 5: Solve for x
    x = 9,975,785,479.02/84,821.40
  6. Step 6: Final answer
    x = 117,609.30

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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.