Home / 86,840.10-129,871.35-72,843.30

Finding the Fourth Proportional to 86,840.10, 129,871.35 and 72,843.30

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Solution

The fourth proportional to 86,840.10, 129,871.35 and 72,843.30 is: 108,938.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,840.10 : 129,871.35 = 72,843.30 : x
  2. Step 2: Convert to fraction form
    86,840.10/129,871.35 = 72,843.30/x
  3. Step 3: Cross multiply
    86,840.10x = 129,871.35 × 72,843.30
  4. Step 4: Simplify right side
    86,840.10x = 9,460,257,709.46
  5. Step 5: Solve for x
    x = 9,460,257,709.46/86,840.10
  6. Step 6: Final answer
    x = 108,938.82

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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.