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Finding the Fourth Proportional to 7,913.76, 10,920.48 and 4,376.88

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Solution

The fourth proportional to 7,913.76, 10,920.48 and 4,376.88 is: 6,039.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,913.76 : 10,920.48 = 4,376.88 : x
  2. Step 2: Convert to fraction form
    7,913.76/10,920.48 = 4,376.88/x
  3. Step 3: Cross multiply
    7,913.76x = 10,920.48 × 4,376.88
  4. Step 4: Simplify right side
    7,913.76x = 47,797,630.50
  5. Step 5: Solve for x
    x = 47,797,630.50/7,913.76
  6. Step 6: Final answer
    x = 6,039.81

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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.