Home / 21,291.86-29,385.09-12,908.18

Finding the Fourth Proportional to 21,291.86, 29,385.09 and 12,908.18

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Solution

The fourth proportional to 21,291.86, 29,385.09 and 12,908.18 is: 17,814.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.86 : 29,385.09 = 12,908.18 : x
  2. Step 2: Convert to fraction form
    21,291.86/29,385.09 = 12,908.18/x
  3. Step 3: Cross multiply
    21,291.86x = 29,385.09 × 12,908.18
  4. Step 4: Simplify right side
    21,291.86x = 379,308,031.04
  5. Step 5: Solve for x
    x = 379,308,031.04/21,291.86
  6. Step 6: Final answer
    x = 17,814.70

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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.