Home / 21,826.13-30,115.40-12,870.36

Finding the Fourth Proportional to 21,826.13, 30,115.40 and 12,870.36

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Solution

The fourth proportional to 21,826.13, 30,115.40 and 12,870.36 is: 17,758.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,826.13 : 30,115.40 = 12,870.36 : x
  2. Step 2: Convert to fraction form
    21,826.13/30,115.40 = 12,870.36/x
  3. Step 3: Cross multiply
    21,826.13x = 30,115.40 × 12,870.36
  4. Step 4: Simplify right side
    21,826.13x = 387,595,975.19
  5. Step 5: Solve for x
    x = 387,595,975.19/21,826.13
  6. Step 6: Final answer
    x = 17,758.35

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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.