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Finding the Fourth Proportional to 23,218.80, 34,828.20 and 21,031.80

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Solution

The fourth proportional to 23,218.80, 34,828.20 and 21,031.80 is: 31,547.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    23,218.80 : 34,828.20 = 21,031.80 : x
  2. Step 2: Convert to fraction form
    23,218.80/34,828.20 = 21,031.80/x
  3. Step 3: Cross multiply
    23,218.80x = 34,828.20 × 21,031.80
  4. Step 4: Simplify right side
    23,218.80x = 732,499,736.76
  5. Step 5: Solve for x
    x = 732,499,736.76/23,218.80
  6. Step 6: Final answer
    x = 31,547.70

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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.