Home / 15,853.29-21,878.19-8,779.70

Finding the Fourth Proportional to 15,853.29, 21,878.19 and 8,779.70

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Solution

The fourth proportional to 15,853.29, 21,878.19 and 8,779.70 is: 12,116.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853.29 : 21,878.19 = 8,779.70 : x
  2. Step 2: Convert to fraction form
    15,853.29/21,878.19 = 8,779.70/x
  3. Step 3: Cross multiply
    15,853.29x = 21,878.19 × 8,779.70
  4. Step 4: Simplify right side
    15,853.29x = 192,083,944.74
  5. Step 5: Solve for x
    x = 192,083,944.74/15,853.29
  6. Step 6: Final answer
    x = 12,116.35

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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.