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Finding the Fourth Proportional to 18,870.80, 28,309.10 and 5,720.04

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Solution

The fourth proportional to 18,870.80, 28,309.10 and 5,720.04 is: 8,580.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.80 : 28,309.10 = 5,720.04 : x
  2. Step 2: Convert to fraction form
    18,870.80/28,309.10 = 5,720.04/x
  3. Step 3: Cross multiply
    18,870.80x = 28,309.10 × 5,720.04
  4. Step 4: Simplify right side
    18,870.80x = 161,929,155.76
  5. Step 5: Solve for x
    x = 161,929,155.76/18,870.80
  6. Step 6: Final answer
    x = 8,580.94

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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.