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Finding the Fourth Proportional to 7,914.40, 10,921.98 and 4,931.44

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Solution

The fourth proportional to 7,914.40, 10,921.98 and 4,931.44 is: 6,805.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,914.40 : 10,921.98 = 4,931.44 : x
  2. Step 2: Convert to fraction form
    7,914.40/10,921.98 = 4,931.44/x
  3. Step 3: Cross multiply
    7,914.40x = 10,921.98 × 4,931.44
  4. Step 4: Simplify right side
    7,914.40x = 53,861,089.05
  5. Step 5: Solve for x
    x = 53,861,089.05/7,914.40
  6. Step 6: Final answer
    x = 6,805.45

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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.