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Finding the Fourth Proportional to 31,520, 43,501.92 and 20,339.84

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Solution

The fourth proportional to 31,520, 43,501.92 and 20,339.84 is: 28,071.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,520 : 43,501.92 = 20,339.84 : x
  2. Step 2: Convert to fraction form
    31,520/43,501.92 = 20,339.84/x
  3. Step 3: Cross multiply
    31,520x = 43,501.92 × 20,339.84
  4. Step 4: Simplify right side
    31,520x = 884,822,092.49
  5. Step 5: Solve for x
    x = 884,822,092.49/31,520
  6. Step 6: Final answer
    x = 28,071.77

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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.