Home / 21,386.49-29,508.30-12,428.90

Finding the Fourth Proportional to 21,386.49, 29,508.30 and 12,428.90

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Solution

The fourth proportional to 21,386.49, 29,508.30 and 12,428.90 is: 17,148.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,386.49 : 29,508.30 = 12,428.90 : x
  2. Step 2: Convert to fraction form
    21,386.49/29,508.30 = 12,428.90/x
  3. Step 3: Cross multiply
    21,386.49x = 29,508.30 × 12,428.90
  4. Step 4: Simplify right side
    21,386.49x = 366,755,709.87
  5. Step 5: Solve for x
    x = 366,755,709.87/21,386.49
  6. Step 6: Final answer
    x = 17,148.94

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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.