Home / 31,345.91-43,269.40-21,278.85

Finding the Fourth Proportional to 31,345.91, 43,269.40 and 21,278.85

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Solution

The fourth proportional to 31,345.91, 43,269.40 and 21,278.85 is: 29,372.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,345.91 : 43,269.40 = 21,278.85 : x
  2. Step 2: Convert to fraction form
    31,345.91/43,269.40 = 21,278.85/x
  3. Step 3: Cross multiply
    31,345.91x = 43,269.40 × 21,278.85
  4. Step 4: Simplify right side
    31,345.91x = 920,723,072.19
  5. Step 5: Solve for x
    x = 920,723,072.19/31,345.91
  6. Step 6: Final answer
    x = 29,372.99

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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.