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Finding the Fourth Proportional to 72,920.25, 100,629.95 and 39,386.25

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Solution

The fourth proportional to 72,920.25, 100,629.95 and 39,386.25 is: 54,353.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,920.25 : 100,629.95 = 39,386.25 : x
  2. Step 2: Convert to fraction form
    72,920.25/100,629.95 = 39,386.25/x
  3. Step 3: Cross multiply
    72,920.25x = 100,629.95 × 39,386.25
  4. Step 4: Simplify right side
    72,920.25x = 3,963,436,171.26
  5. Step 5: Solve for x
    x = 3,963,436,171.26/72,920.25
  6. Step 6: Final answer
    x = 54,353.03

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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.