Home / 21,821.18-30,117.12-12,868.16

Finding the Fourth Proportional to 21,821.18, 30,117.12 and 12,868.16

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Solution

The fourth proportional to 21,821.18, 30,117.12 and 12,868.16 is: 17,760.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.18 : 30,117.12 = 12,868.16 : x
  2. Step 2: Convert to fraction form
    21,821.18/30,117.12 = 12,868.16/x
  3. Step 3: Cross multiply
    21,821.18x = 30,117.12 × 12,868.16
  4. Step 4: Simplify right side
    21,821.18x = 387,551,918.90
  5. Step 5: Solve for x
    x = 387,551,918.90/21,821.18
  6. Step 6: Final answer
    x = 17,760.36

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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.