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Finding the Fourth Proportional to 7,881.10, 11,810.71 and 3,980.95

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Solution

The fourth proportional to 7,881.10, 11,810.71 and 3,980.95 is: 5,965.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,881.10 : 11,810.71 = 3,980.95 : x
  2. Step 2: Convert to fraction form
    7,881.10/11,810.71 = 3,980.95/x
  3. Step 3: Cross multiply
    7,881.10x = 11,810.71 × 3,980.95
  4. Step 4: Simplify right side
    7,881.10x = 47,017,821.42
  5. Step 5: Solve for x
    x = 47,017,821.42/7,881.10
  6. Step 6: Final answer
    x = 5,965.90

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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.