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Finding the Fourth Proportional to 18,830.50, 28,218.50 and 10,398.66

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Solution

The fourth proportional to 18,830.50, 28,218.50 and 10,398.66 is: 15,582.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,830.50 : 28,218.50 = 10,398.66 : x
  2. Step 2: Convert to fraction form
    18,830.50/28,218.50 = 10,398.66/x
  3. Step 3: Cross multiply
    18,830.50x = 28,218.50 × 10,398.66
  4. Step 4: Simplify right side
    18,830.50x = 293,434,587.21
  5. Step 5: Solve for x
    x = 293,434,587.21/18,830.50
  6. Step 6: Final answer
    x = 15,582.94

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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.