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Finding the Fourth Proportional to 115,915.20, 162,631.20 and 115,915.20

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Solution

The fourth proportional to 115,915.20, 162,631.20 and 115,915.20 is: 162,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,915.20 : 162,631.20 = 115,915.20 : x
  2. Step 2: Convert to fraction form
    115,915.20/162,631.20 = 115,915.20/x
  3. Step 3: Cross multiply
    115,915.20x = 162,631.20 × 115,915.20
  4. Step 4: Simplify right side
    115,915.20x = 18,851,428,074.24
  5. Step 5: Solve for x
    x = 18,851,428,074.24/115,915.20
  6. Step 6: Final answer
    x = 162,631.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.