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Finding the Fourth Proportional to 9,001.88, 12,420.72 and 6,615.60

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Solution

The fourth proportional to 9,001.88, 12,420.72 and 6,615.60 is: 9,128.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,001.88 : 12,420.72 = 6,615.60 : x
  2. Step 2: Convert to fraction form
    9,001.88/12,420.72 = 6,615.60/x
  3. Step 3: Cross multiply
    9,001.88x = 12,420.72 × 6,615.60
  4. Step 4: Simplify right side
    9,001.88x = 82,170,515.23
  5. Step 5: Solve for x
    x = 82,170,515.23/9,001.88
  6. Step 6: Final answer
    x = 9,128.15

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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.