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Finding the Fourth Proportional to 40,686.70, 61,039.80 and 16,981.06

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Solution

The fourth proportional to 40,686.70, 61,039.80 and 16,981.06 is: 25,475.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,686.70 : 61,039.80 = 16,981.06 : x
  2. Step 2: Convert to fraction form
    40,686.70/61,039.80 = 16,981.06/x
  3. Step 3: Cross multiply
    40,686.70x = 61,039.80 × 16,981.06
  4. Step 4: Simplify right side
    40,686.70x = 1,036,520,506.19
  5. Step 5: Solve for x
    x = 1,036,520,506.19/40,686.70
  6. Step 6: Final answer
    x = 25,475.66

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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.