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Finding the Fourth Proportional to 72,972.69, 100,702.49 and 39,438.69

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Solution

The fourth proportional to 72,972.69, 100,702.49 and 39,438.69 is: 54,425.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,972.69 : 100,702.49 = 39,438.69 : x
  2. Step 2: Convert to fraction form
    72,972.69/100,702.49 = 39,438.69/x
  3. Step 3: Cross multiply
    72,972.69x = 100,702.49 × 39,438.69
  4. Step 4: Simplify right side
    72,972.69x = 3,971,574,088.14
  5. Step 5: Solve for x
    x = 3,971,574,088.14/72,972.69
  6. Step 6: Final answer
    x = 54,425.49

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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.