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Finding the Fourth Proportional to 8,638.44, 12,957.72 and 4,740.72

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Solution

The fourth proportional to 8,638.44, 12,957.72 and 4,740.72 is: 7,111.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.44 : 12,957.72 = 4,740.72 : x
  2. Step 2: Convert to fraction form
    8,638.44/12,957.72 = 4,740.72/x
  3. Step 3: Cross multiply
    8,638.44x = 12,957.72 × 4,740.72
  4. Step 4: Simplify right side
    8,638.44x = 61,428,922.36
  5. Step 5: Solve for x
    x = 61,428,922.36/8,638.44
  6. Step 6: Final answer
    x = 7,111.11

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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.