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Finding the Fourth Proportional to 28,543.80, 42,815.70 and 26,815.80

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Solution

The fourth proportional to 28,543.80, 42,815.70 and 26,815.80 is: 40,223.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,543.80 : 42,815.70 = 26,815.80 : x
  2. Step 2: Convert to fraction form
    28,543.80/42,815.70 = 26,815.80/x
  3. Step 3: Cross multiply
    28,543.80x = 42,815.70 × 26,815.80
  4. Step 4: Simplify right side
    28,543.80x = 1,148,137,248.06
  5. Step 5: Solve for x
    x = 1,148,137,248.06/28,543.80
  6. Step 6: Final answer
    x = 40,223.70

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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.