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Finding the Fourth Proportional to 72,963.21, 100,689.30 and 39,429.21

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Solution

The fourth proportional to 72,963.21, 100,689.30 and 39,429.21 is: 54,412.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,963.21 : 100,689.30 = 39,429.21 : x
  2. Step 2: Convert to fraction form
    72,963.21/100,689.30 = 39,429.21/x
  3. Step 3: Cross multiply
    72,963.21x = 100,689.30 × 39,429.21
  4. Step 4: Simplify right side
    72,963.21x = 3,970,099,554.45
  5. Step 5: Solve for x
    x = 3,970,099,554.45/72,963.21
  6. Step 6: Final answer
    x = 54,412.35

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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.