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Finding the Fourth Proportional to 7,920.67, 11,883.65 and 2,656.20

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Solution

The fourth proportional to 7,920.67, 11,883.65 and 2,656.20 is: 3,985.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.67 : 11,883.65 = 2,656.20 : x
  2. Step 2: Convert to fraction form
    7,920.67/11,883.65 = 2,656.20/x
  3. Step 3: Cross multiply
    7,920.67x = 11,883.65 × 2,656.20
  4. Step 4: Simplify right side
    7,920.67x = 31,565,337.85
  5. Step 5: Solve for x
    x = 31,565,337.85/7,920.67
  6. Step 6: Final answer
    x = 3,985.19

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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.