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Finding the Fourth Proportional to 39,808.60, 59,640.90 and 18,986.20

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Solution

The fourth proportional to 39,808.60, 59,640.90 and 18,986.20 is: 28,444.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,808.60 : 59,640.90 = 18,986.20 : x
  2. Step 2: Convert to fraction form
    39,808.60/59,640.90 = 18,986.20/x
  3. Step 3: Cross multiply
    39,808.60x = 59,640.90 × 18,986.20
  4. Step 4: Simplify right side
    39,808.60x = 1,132,354,055.58
  5. Step 5: Solve for x
    x = 1,132,354,055.58/39,808.60
  6. Step 6: Final answer
    x = 28,444.96

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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.