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Finding the Fourth Proportional to 18,968.79, 28,461.85 and 7,877.97

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Solution

The fourth proportional to 18,968.79, 28,461.85 and 7,877.97 is: 11,820.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,968.79 : 28,461.85 = 7,877.97 : x
  2. Step 2: Convert to fraction form
    18,968.79/28,461.85 = 7,877.97/x
  3. Step 3: Cross multiply
    18,968.79x = 28,461.85 × 7,877.97
  4. Step 4: Simplify right side
    18,968.79x = 224,221,580.75
  5. Step 5: Solve for x
    x = 224,221,580.75/18,968.79
  6. Step 6: Final answer
    x = 11,820.55

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1.5x scale

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.