Home / 7,915.16-11,870.40-2,981.12

Finding the Fourth Proportional to 7,915.16, 11,870.40 and 2,981.12

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Solution

The fourth proportional to 7,915.16, 11,870.40 and 2,981.12 is: 4,470.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.16 : 11,870.40 = 2,981.12 : x
  2. Step 2: Convert to fraction form
    7,915.16/11,870.40 = 2,981.12/x
  3. Step 3: Cross multiply
    7,915.16x = 11,870.40 × 2,981.12
  4. Step 4: Simplify right side
    7,915.16x = 35,387,086.85
  5. Step 5: Solve for x
    x = 35,387,086.85/7,915.16
  6. Step 6: Final answer
    x = 4,470.80

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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.