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Finding the Fourth Proportional to 4,752.60, 7,128.90 and 4,720.20

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Solution

The fourth proportional to 4,752.60, 7,128.90 and 4,720.20 is: 7,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,752.60 : 7,128.90 = 4,720.20 : x
  2. Step 2: Convert to fraction form
    4,752.60/7,128.90 = 4,720.20/x
  3. Step 3: Cross multiply
    4,752.60x = 7,128.90 × 4,720.20
  4. Step 4: Simplify right side
    4,752.60x = 33,649,833.78
  5. Step 5: Solve for x
    x = 33,649,833.78/4,752.60
  6. Step 6: Final answer
    x = 7,080.30

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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.