Home / 21,279.51-31,908.43-12,397.66

Finding the Fourth Proportional to 21,279.51, 31,908.43 and 12,397.66

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Solution

The fourth proportional to 21,279.51, 31,908.43 and 12,397.66 is: 18,590.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.51 : 31,908.43 = 12,397.66 : x
  2. Step 2: Convert to fraction form
    21,279.51/31,908.43 = 12,397.66/x
  3. Step 3: Cross multiply
    21,279.51x = 31,908.43 × 12,397.66
  4. Step 4: Simplify right side
    21,279.51x = 395,589,802.00
  5. Step 5: Solve for x
    x = 395,589,802.00/21,279.51
  6. Step 6: Final answer
    x = 18,590.17

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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.