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Finding the Fourth Proportional to 8,958.90, 12,360 and 5,420.82

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Solution

The fourth proportional to 8,958.90, 12,360 and 5,420.82 is: 7,478.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,958.90 : 12,360 = 5,420.82 : x
  2. Step 2: Convert to fraction form
    8,958.90/12,360 = 5,420.82/x
  3. Step 3: Cross multiply
    8,958.90x = 12,360 × 5,420.82
  4. Step 4: Simplify right side
    8,958.90x = 67,001,335.20
  5. Step 5: Solve for x
    x = 67,001,335.20/8,958.90
  6. Step 6: Final answer
    x = 7,478.75

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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.