Home / 7,915.30-10,911.45-5,815.78

Finding the Fourth Proportional to 7,915.30, 10,911.45 and 5,815.78

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Solution

The fourth proportional to 7,915.30, 10,911.45 and 5,815.78 is: 8,017.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.30 : 10,911.45 = 5,815.78 : x
  2. Step 2: Convert to fraction form
    7,915.30/10,911.45 = 5,815.78/x
  3. Step 3: Cross multiply
    7,915.30x = 10,911.45 × 5,815.78
  4. Step 4: Simplify right side
    7,915.30x = 63,458,592.68
  5. Step 5: Solve for x
    x = 63,458,592.68/7,915.30
  6. Step 6: Final answer
    x = 8,017.21

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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.