Home / 21,822.16-30,118-12,870.65

Finding the Fourth Proportional to 21,822.16, 30,118 and 12,870.65

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Solution

The fourth proportional to 21,822.16, 30,118 and 12,870.65 is: 17,763.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,822.16 : 30,118 = 12,870.65 : x
  2. Step 2: Convert to fraction form
    21,822.16/30,118 = 12,870.65/x
  3. Step 3: Cross multiply
    21,822.16x = 30,118 × 12,870.65
  4. Step 4: Simplify right side
    21,822.16x = 387,638,236.70
  5. Step 5: Solve for x
    x = 387,638,236.70/21,822.16
  6. Step 6: Final answer
    x = 17,763.51

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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.