Home / 20,385.65-28,132.49-12,318.19

Finding the Fourth Proportional to 20,385.65, 28,132.49 and 12,318.19

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Solution

The fourth proportional to 20,385.65, 28,132.49 and 12,318.19 is: 16,999.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.65 : 28,132.49 = 12,318.19 : x
  2. Step 2: Convert to fraction form
    20,385.65/28,132.49 = 12,318.19/x
  3. Step 3: Cross multiply
    20,385.65x = 28,132.49 × 12,318.19
  4. Step 4: Simplify right side
    20,385.65x = 346,541,225.07
  5. Step 5: Solve for x
    x = 346,541,225.07/20,385.65
  6. Step 6: Final answer
    x = 16,999.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.