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Finding the Fourth Proportional to 40,894.70, 61,381.20 and 21,187.40

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Solution

The fourth proportional to 40,894.70, 61,381.20 and 21,187.40 is: 31,801.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,894.70 : 61,381.20 = 21,187.40 : x
  2. Step 2: Convert to fraction form
    40,894.70/61,381.20 = 21,187.40/x
  3. Step 3: Cross multiply
    40,894.70x = 61,381.20 × 21,187.40
  4. Step 4: Simplify right side
    40,894.70x = 1,300,508,036.88
  5. Step 5: Solve for x
    x = 1,300,508,036.88/40,894.70
  6. Step 6: Final answer
    x = 31,801.38

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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.