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Finding the Fourth Proportional to 7,915.81, 10,921.80 and 4,557.86

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Solution

The fourth proportional to 7,915.81, 10,921.80 and 4,557.86 is: 6,288.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.81 : 10,921.80 = 4,557.86 : x
  2. Step 2: Convert to fraction form
    7,915.81/10,921.80 = 4,557.86/x
  3. Step 3: Cross multiply
    7,915.81x = 10,921.80 × 4,557.86
  4. Step 4: Simplify right side
    7,915.81x = 49,780,035.35
  5. Step 5: Solve for x
    x = 49,780,035.35/7,915.81
  6. Step 6: Final answer
    x = 6,288.68

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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.