Home / 15,785.07-21,782.76-8,711.40

Finding the Fourth Proportional to 15,785.07, 21,782.76 and 8,711.40

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Solution

The fourth proportional to 15,785.07, 21,782.76 and 8,711.40 is: 12,021.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,785.07 : 21,782.76 = 8,711.40 : x
  2. Step 2: Convert to fraction form
    15,785.07/21,782.76 = 8,711.40/x
  3. Step 3: Cross multiply
    15,785.07x = 21,782.76 × 8,711.40
  4. Step 4: Simplify right side
    15,785.07x = 189,758,335.46
  5. Step 5: Solve for x
    x = 189,758,335.46/15,785.07
  6. Step 6: Final answer
    x = 12,021.38

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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.