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Finding the Fourth Proportional to 21,065.70, 31,598.55 and 19,121.70

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Solution

The fourth proportional to 21,065.70, 31,598.55 and 19,121.70 is: 28,682.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,065.70 : 31,598.55 = 19,121.70 : x
  2. Step 2: Convert to fraction form
    21,065.70/31,598.55 = 19,121.70/x
  3. Step 3: Cross multiply
    21,065.70x = 31,598.55 × 19,121.70
  4. Step 4: Simplify right side
    21,065.70x = 604,217,993.54
  5. Step 5: Solve for x
    x = 604,217,993.54/21,065.70
  6. Step 6: Final answer
    x = 28,682.55

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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.