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Finding the Fourth Proportional to 8,918.60, 12,269.93 and 8,672.55

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Solution

The fourth proportional to 8,918.60, 12,269.93 and 8,672.55 is: 11,931.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.60 : 12,269.93 = 8,672.55 : x
  2. Step 2: Convert to fraction form
    8,918.60/12,269.93 = 8,672.55/x
  3. Step 3: Cross multiply
    8,918.60x = 12,269.93 × 8,672.55
  4. Step 4: Simplify right side
    8,918.60x = 106,411,538.06
  5. Step 5: Solve for x
    x = 106,411,538.06/8,918.60
  6. Step 6: Final answer
    x = 11,931.42

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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.