Home / 21,127.60-31,679.60-8,656.32

Finding the Fourth Proportional to 21,127.60, 31,679.60 and 8,656.32

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Solution

The fourth proportional to 21,127.60, 31,679.60 and 8,656.32 is: 12,979.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,127.60 : 31,679.60 = 8,656.32 : x
  2. Step 2: Convert to fraction form
    21,127.60/31,679.60 = 8,656.32/x
  3. Step 3: Cross multiply
    21,127.60x = 31,679.60 × 8,656.32
  4. Step 4: Simplify right side
    21,127.60x = 274,228,755.07
  5. Step 5: Solve for x
    x = 274,228,755.07/21,127.60
  6. Step 6: Final answer
    x = 12,979.65

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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.