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Finding the Fourth Proportional to 18,869.16, 28,309.65 and 7,781.07

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Solution

The fourth proportional to 18,869.16, 28,309.65 and 7,781.07 is: 11,674.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,869.16 : 28,309.65 = 7,781.07 : x
  2. Step 2: Convert to fraction form
    18,869.16/28,309.65 = 7,781.07/x
  3. Step 3: Cross multiply
    18,869.16x = 28,309.65 × 7,781.07
  4. Step 4: Simplify right side
    18,869.16x = 220,279,368.33
  5. Step 5: Solve for x
    x = 220,279,368.33/18,869.16
  6. Step 6: Final answer
    x = 11,674.04

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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.