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Finding the Fourth Proportional to 21,303.80, 31,955.70 and 7,279.67

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Solution

The fourth proportional to 21,303.80, 31,955.70 and 7,279.67 is: 10,919.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,303.80 : 31,955.70 = 7,279.67 : x
  2. Step 2: Convert to fraction form
    21,303.80/31,955.70 = 7,279.67/x
  3. Step 3: Cross multiply
    21,303.80x = 31,955.70 × 7,279.67
  4. Step 4: Simplify right side
    21,303.80x = 232,626,950.62
  5. Step 5: Solve for x
    x = 232,626,950.62/21,303.80
  6. Step 6: Final answer
    x = 10,919.51

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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.