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Finding the Fourth Proportional to 8,445.18, 12,667.80 and 4,980

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Solution

The fourth proportional to 8,445.18, 12,667.80 and 4,980 is: 7,470.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,445.18 : 12,667.80 = 4,980 : x
  2. Step 2: Convert to fraction form
    8,445.18/12,667.80 = 4,980/x
  3. Step 3: Cross multiply
    8,445.18x = 12,667.80 × 4,980
  4. Step 4: Simplify right side
    8,445.18x = 63,085,644
  5. Step 5: Solve for x
    x = 63,085,644/8,445.18
  6. Step 6: Final answer
    x = 7,470.02

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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.