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Finding the Fourth Proportional to 875.20, 1,207.70 and 482.20

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Solution

The fourth proportional to 875.20, 1,207.70 and 482.20 is: 665.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.20 : 1,207.70 = 482.20 : x
  2. Step 2: Convert to fraction form
    875.20/1,207.70 = 482.20/x
  3. Step 3: Cross multiply
    875.20x = 1,207.70 × 482.20
  4. Step 4: Simplify right side
    875.20x = 582,352.94
  5. Step 5: Solve for x
    x = 582,352.94/875.20
  6. Step 6: Final answer
    x = 665.39

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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.