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Finding the Fourth Proportional to 7,913.40, 10,920.62 and 4,376.62

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Solution

The fourth proportional to 7,913.40, 10,920.62 and 4,376.62 is: 6,039.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,913.40 : 10,920.62 = 4,376.62 : x
  2. Step 2: Convert to fraction form
    7,913.40/10,920.62 = 4,376.62/x
  3. Step 3: Cross multiply
    7,913.40x = 10,920.62 × 4,376.62
  4. Step 4: Simplify right side
    7,913.40x = 47,795,403.90
  5. Step 5: Solve for x
    x = 47,795,403.90/7,913.40
  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.