Home / 15,780.11-21,776.51-8,706.54

Finding the Fourth Proportional to 15,780.11, 21,776.51 and 8,706.54

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Solution

The fourth proportional to 15,780.11, 21,776.51 and 8,706.54 is: 12,015.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.11 : 21,776.51 = 8,706.54 : x
  2. Step 2: Convert to fraction form
    15,780.11/21,776.51 = 8,706.54/x
  3. Step 3: Cross multiply
    15,780.11x = 21,776.51 × 8,706.54
  4. Step 4: Simplify right side
    15,780.11x = 189,598,011.84
  5. Step 5: Solve for x
    x = 189,598,011.84/15,780.11
  6. Step 6: Final answer
    x = 12,015.00

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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.