Home / 21,647.13-29,874.47-13,686.45

Finding the Fourth Proportional to 21,647.13, 29,874.47 and 13,686.45

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Solution

The fourth proportional to 21,647.13, 29,874.47 and 13,686.45 is: 18,888.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,647.13 : 29,874.47 = 13,686.45 : x
  2. Step 2: Convert to fraction form
    21,647.13/29,874.47 = 13,686.45/x
  3. Step 3: Cross multiply
    21,647.13x = 29,874.47 × 13,686.45
  4. Step 4: Simplify right side
    21,647.13x = 408,875,371.50
  5. Step 5: Solve for x
    x = 408,875,371.50/21,647.13
  6. Step 6: Final answer
    x = 18,888.20

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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.