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Finding the Fourth Proportional to 8,969.90, 12,377.40 and 4,990.48

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Solution

The fourth proportional to 8,969.90, 12,377.40 and 4,990.48 is: 6,886.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,969.90 : 12,377.40 = 4,990.48 : x
  2. Step 2: Convert to fraction form
    8,969.90/12,377.40 = 4,990.48/x
  3. Step 3: Cross multiply
    8,969.90x = 12,377.40 × 4,990.48
  4. Step 4: Simplify right side
    8,969.90x = 61,769,167.15
  5. Step 5: Solve for x
    x = 61,769,167.15/8,969.90
  6. Step 6: Final answer
    x = 6,886.27

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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.