Home / 15,855.16-21,878.70-8,779.72

Finding the Fourth Proportional to 15,855.16, 21,878.70 and 8,779.72

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Solution

The fourth proportional to 15,855.16, 21,878.70 and 8,779.72 is: 12,115.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.16 : 21,878.70 = 8,779.72 : x
  2. Step 2: Convert to fraction form
    15,855.16/21,878.70 = 8,779.72/x
  3. Step 3: Cross multiply
    15,855.16x = 21,878.70 × 8,779.72
  4. Step 4: Simplify right side
    15,855.16x = 192,088,859.96
  5. Step 5: Solve for x
    x = 192,088,859.96/15,855.16
  6. Step 6: Final answer
    x = 12,115.23

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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.