Home / 15,811.51-21,819.95-8,641.57

Finding the Fourth Proportional to 15,811.51, 21,819.95 and 8,641.57

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Solution

The fourth proportional to 15,811.51, 21,819.95 and 8,641.57 is: 11,925.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.51 : 21,819.95 = 8,641.57 : x
  2. Step 2: Convert to fraction form
    15,811.51/21,819.95 = 8,641.57/x
  3. Step 3: Cross multiply
    15,811.51x = 21,819.95 × 8,641.57
  4. Step 4: Simplify right side
    15,811.51x = 188,558,473.01
  5. Step 5: Solve for x
    x = 188,558,473.01/15,811.51
  6. Step 6: Final answer
    x = 11,925.40

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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.