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Finding the Fourth Proportional to 12,915.22, 17,820.08 and 7,610.52

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Solution

The fourth proportional to 12,915.22, 17,820.08 and 7,610.52 is: 10,500.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.22 : 17,820.08 = 7,610.52 : x
  2. Step 2: Convert to fraction form
    12,915.22/17,820.08 = 7,610.52/x
  3. Step 3: Cross multiply
    12,915.22x = 17,820.08 × 7,610.52
  4. Step 4: Simplify right side
    12,915.22x = 135,620,075.24
  5. Step 5: Solve for x
    x = 135,620,075.24/12,915.22
  6. Step 6: Final answer
    x = 10,500.79

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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.