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Finding the Fourth Proportional to 21,248.80, 31,842.20 and 18,913.50

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Solution

The fourth proportional to 21,248.80, 31,842.20 and 18,913.50 is: 28,342.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,248.80 : 31,842.20 = 18,913.50 : x
  2. Step 2: Convert to fraction form
    21,248.80/31,842.20 = 18,913.50/x
  3. Step 3: Cross multiply
    21,248.80x = 31,842.20 × 18,913.50
  4. Step 4: Simplify right side
    21,248.80x = 602,247,496.98
  5. Step 5: Solve for x
    x = 602,247,496.98/21,248.80
  6. Step 6: Final answer
    x = 28,342.66

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1.5x scale

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.