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Finding the Fourth Proportional to 31,386.50, 43,317.21 and 18,138.50

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Solution

The fourth proportional to 31,386.50, 43,317.21 and 18,138.50 is: 25,033.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,386.50 : 43,317.21 = 18,138.50 : x
  2. Step 2: Convert to fraction form
    31,386.50/43,317.21 = 18,138.50/x
  3. Step 3: Cross multiply
    31,386.50x = 43,317.21 × 18,138.50
  4. Step 4: Simplify right side
    31,386.50x = 785,709,213.59
  5. Step 5: Solve for x
    x = 785,709,213.59/31,386.50
  6. Step 6: Final answer
    x = 25,033.35

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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.