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Finding the Fourth Proportional to 20,368.67, 28,089.05 and 15,890.78

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Solution

The fourth proportional to 20,368.67, 28,089.05 and 15,890.78 is: 21,913.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,368.67 : 28,089.05 = 15,890.78 : x
  2. Step 2: Convert to fraction form
    20,368.67/28,089.05 = 15,890.78/x
  3. Step 3: Cross multiply
    20,368.67x = 28,089.05 × 15,890.78
  4. Step 4: Simplify right side
    20,368.67x = 446,356,904.73
  5. Step 5: Solve for x
    x = 446,356,904.73/20,368.67
  6. Step 6: Final answer
    x = 21,913.90

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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.