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Finding the Fourth Proportional to 8,715, 12,009.90 and 5,565.72

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Solution

The fourth proportional to 8,715, 12,009.90 and 5,565.72 is: 7,669.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,715 : 12,009.90 = 5,565.72 : x
  2. Step 2: Convert to fraction form
    8,715/12,009.90 = 5,565.72/x
  3. Step 3: Cross multiply
    8,715x = 12,009.90 × 5,565.72
  4. Step 4: Simplify right side
    8,715x = 66,843,740.63
  5. Step 5: Solve for x
    x = 66,843,740.63/8,715
  6. Step 6: Final answer
    x = 7,669.96

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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.