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Finding the Fourth Proportional to 28,091, 42,148.80 and 13,310.48

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Solution

The fourth proportional to 28,091, 42,148.80 and 13,310.48 is: 19,971.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,091 : 42,148.80 = 13,310.48 : x
  2. Step 2: Convert to fraction form
    28,091/42,148.80 = 13,310.48/x
  3. Step 3: Cross multiply
    28,091x = 42,148.80 × 13,310.48
  4. Step 4: Simplify right side
    28,091x = 561,020,759.42
  5. Step 5: Solve for x
    x = 561,020,759.42/28,091
  6. Step 6: Final answer
    x = 19,971.55

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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.