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Finding the Fourth Proportional to 21,751.78, 30,016.29 and 12,320.14

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Solution

The fourth proportional to 21,751.78, 30,016.29 and 12,320.14 is: 17,001.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,751.78 : 30,016.29 = 12,320.14 : x
  2. Step 2: Convert to fraction form
    21,751.78/30,016.29 = 12,320.14/x
  3. Step 3: Cross multiply
    21,751.78x = 30,016.29 × 12,320.14
  4. Step 4: Simplify right side
    21,751.78x = 369,804,895.08
  5. Step 5: Solve for x
    x = 369,804,895.08/21,751.78
  6. Step 6: Final answer
    x = 17,001.13

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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.