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Finding the Fourth Proportional to 31,389.99, 43,317.99 and 18,814.74

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Solution

The fourth proportional to 31,389.99, 43,317.99 and 18,814.74 is: 25,964.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,389.99 : 43,317.99 = 18,814.74 : x
  2. Step 2: Convert to fraction form
    31,389.99/43,317.99 = 18,814.74/x
  3. Step 3: Cross multiply
    31,389.99x = 43,317.99 × 18,814.74
  4. Step 4: Simplify right side
    31,389.99x = 815,016,719.17
  5. Step 5: Solve for x
    x = 815,016,719.17/31,389.99
  6. Step 6: Final answer
    x = 25,964.22

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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.