Home / 86,721.40-129,930.90-39,878.20

Finding the Fourth Proportional to 86,721.40, 129,930.90 and 39,878.20

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Solution

The fourth proportional to 86,721.40, 129,930.90 and 39,878.20 is: 59,747.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,721.40 : 129,930.90 = 39,878.20 : x
  2. Step 2: Convert to fraction form
    86,721.40/129,930.90 = 39,878.20/x
  3. Step 3: Cross multiply
    86,721.40x = 129,930.90 × 39,878.20
  4. Step 4: Simplify right side
    86,721.40x = 5,181,410,416.38
  5. Step 5: Solve for x
    x = 5,181,410,416.38/86,721.40
  6. Step 6: Final answer
    x = 59,747.77

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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.