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Finding the Fourth Proportional to 72,915.16, 100,622.86 and 39,381.16

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Solution

The fourth proportional to 72,915.16, 100,622.86 and 39,381.16 is: 54,345.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,915.16 : 100,622.86 = 39,381.16 : x
  2. Step 2: Convert to fraction form
    72,915.16/100,622.86 = 39,381.16/x
  3. Step 3: Cross multiply
    72,915.16x = 100,622.86 × 39,381.16
  4. Step 4: Simplify right side
    72,915.16x = 3,962,644,949.32
  5. Step 5: Solve for x
    x = 3,962,644,949.32/72,915.16
  6. Step 6: Final answer
    x = 54,345.97

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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.