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Finding the Fourth Proportional to 10,915.55, 15,028.91 and 9,917.84

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Solution

The fourth proportional to 10,915.55, 15,028.91 and 9,917.84 is: 13,655.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,915.55 : 15,028.91 = 9,917.84 : x
  2. Step 2: Convert to fraction form
    10,915.55/15,028.91 = 9,917.84/x
  3. Step 3: Cross multiply
    10,915.55x = 15,028.91 × 9,917.84
  4. Step 4: Simplify right side
    10,915.55x = 149,054,200.02
  5. Step 5: Solve for x
    x = 149,054,200.02/10,915.55
  6. Step 6: Final answer
    x = 13,655.22

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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.