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Finding the Fourth Proportional to 39,883.59, 55,042.54 and 21,981.63

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Solution

The fourth proportional to 39,883.59, 55,042.54 and 21,981.63 is: 30,336.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,883.59 : 55,042.54 = 21,981.63 : x
  2. Step 2: Convert to fraction form
    39,883.59/55,042.54 = 21,981.63/x
  3. Step 3: Cross multiply
    39,883.59x = 55,042.54 × 21,981.63
  4. Step 4: Simplify right side
    39,883.59x = 1,209,924,590.38
  5. Step 5: Solve for x
    x = 1,209,924,590.38/39,883.59
  6. Step 6: Final answer
    x = 30,336.40

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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.