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Finding the Fourth Proportional to 8,778.80, 12,117.48 and 7,223.60

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Solution

The fourth proportional to 8,778.80, 12,117.48 and 7,223.60 is: 9,970.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,778.80 : 12,117.48 = 7,223.60 : x
  2. Step 2: Convert to fraction form
    8,778.80/12,117.48 = 7,223.60/x
  3. Step 3: Cross multiply
    8,778.80x = 12,117.48 × 7,223.60
  4. Step 4: Simplify right side
    8,778.80x = 87,531,828.53
  5. Step 5: Solve for x
    x = 87,531,828.53/8,778.80
  6. Step 6: Final answer
    x = 9,970.82

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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.