Home / 3,915.65-5,403.48-2,147.20

Finding the Fourth Proportional to 3,915.65, 5,403.48 and 2,147.20

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Solution

The fourth proportional to 3,915.65, 5,403.48 and 2,147.20 is: 2,963.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.65 : 5,403.48 = 2,147.20 : x
  2. Step 2: Convert to fraction form
    3,915.65/5,403.48 = 2,147.20/x
  3. Step 3: Cross multiply
    3,915.65x = 5,403.48 × 2,147.20
  4. Step 4: Simplify right side
    3,915.65x = 11,602,325.24
  5. Step 5: Solve for x
    x = 11,602,325.24/3,915.65
  6. Step 6: Final answer
    x = 2,963.06

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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.