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Finding the Fourth Proportional to 20,920.71, 28,870.80 and 11,360.69

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Solution

The fourth proportional to 20,920.71, 28,870.80 and 11,360.69 is: 15,677.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.71 : 28,870.80 = 11,360.69 : x
  2. Step 2: Convert to fraction form
    20,920.71/28,870.80 = 11,360.69/x
  3. Step 3: Cross multiply
    20,920.71x = 28,870.80 × 11,360.69
  4. Step 4: Simplify right side
    20,920.71x = 327,992,130.16
  5. Step 5: Solve for x
    x = 327,992,130.16/20,920.71
  6. Step 6: Final answer
    x = 15,677.87

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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.