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Finding the Fourth Proportional to 39,886.80, 59,878.80 and 20,155.20

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Solution

The fourth proportional to 39,886.80, 59,878.80 and 20,155.20 is: 30,257.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,886.80 : 59,878.80 = 20,155.20 : x
  2. Step 2: Convert to fraction form
    39,886.80/59,878.80 = 20,155.20/x
  3. Step 3: Cross multiply
    39,886.80x = 59,878.80 × 20,155.20
  4. Step 4: Simplify right side
    39,886.80x = 1,206,869,189.76
  5. Step 5: Solve for x
    x = 1,206,869,189.76/39,886.80
  6. Step 6: Final answer
    x = 30,257.36

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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.