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Finding the Fourth Proportional to 7,104.90, 10,661.40 and 4,915.20

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Solution

The fourth proportional to 7,104.90, 10,661.40 and 4,915.20 is: 7,375.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,104.90 : 10,661.40 = 4,915.20 : x
  2. Step 2: Convert to fraction form
    7,104.90/10,661.40 = 4,915.20/x
  3. Step 3: Cross multiply
    7,104.90x = 10,661.40 × 4,915.20
  4. Step 4: Simplify right side
    7,104.90x = 52,402,913.28
  5. Step 5: Solve for x
    x = 52,402,913.28/7,104.90
  6. Step 6: Final answer
    x = 7,375.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.