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Finding the Fourth Proportional to 8,720.48, 12,008.04 and 7,886.96

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Solution

The fourth proportional to 8,720.48, 12,008.04 and 7,886.96 is: 10,860.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.48 : 12,008.04 = 7,886.96 : x
  2. Step 2: Convert to fraction form
    8,720.48/12,008.04 = 7,886.96/x
  3. Step 3: Cross multiply
    8,720.48x = 12,008.04 × 7,886.96
  4. Step 4: Simplify right side
    8,720.48x = 94,706,931.16
  5. Step 5: Solve for x
    x = 94,706,931.16/8,720.48
  6. Step 6: Final answer
    x = 10,860.29

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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.