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Finding the Fourth Proportional to 42,445, 63,667.50 and 13,261

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Solution

The fourth proportional to 42,445, 63,667.50 and 13,261 is: 19,891.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,445 : 63,667.50 = 13,261 : x
  2. Step 2: Convert to fraction form
    42,445/63,667.50 = 13,261/x
  3. Step 3: Cross multiply
    42,445x = 63,667.50 × 13,261
  4. Step 4: Simplify right side
    42,445x = 844,294,717.50
  5. Step 5: Solve for x
    x = 844,294,717.50/42,445
  6. Step 6: Final answer
    x = 19,891.50

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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.