Home / 21,011.52-31,518.72-7,158.72

Finding the Fourth Proportional to 21,011.52, 31,518.72 and 7,158.72

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Solution

The fourth proportional to 21,011.52, 31,518.72 and 7,158.72 is: 10,738.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.52 : 31,518.72 = 7,158.72 : x
  2. Step 2: Convert to fraction form
    21,011.52/31,518.72 = 7,158.72/x
  3. Step 3: Cross multiply
    21,011.52x = 31,518.72 × 7,158.72
  4. Step 4: Simplify right side
    21,011.52x = 225,633,691.24
  5. Step 5: Solve for x
    x = 225,633,691.24/21,011.52
  6. Step 6: Final answer
    x = 10,738.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.