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Finding the Fourth Proportional to 10,988.88, 15,149.88 and 7,839.60

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Solution

The fourth proportional to 10,988.88, 15,149.88 and 7,839.60 is: 10,808.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,988.88 : 15,149.88 = 7,839.60 : x
  2. Step 2: Convert to fraction form
    10,988.88/15,149.88 = 7,839.60/x
  3. Step 3: Cross multiply
    10,988.88x = 15,149.88 × 7,839.60
  4. Step 4: Simplify right side
    10,988.88x = 118,768,999.25
  5. Step 5: Solve for x
    x = 118,768,999.25/10,988.88
  6. Step 6: Final answer
    x = 10,808.11

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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.