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Finding the Fourth Proportional to 91,690.65, 136,915.20 and 72,758.16

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Solution

The fourth proportional to 91,690.65, 136,915.20 and 72,758.16 is: 108,644.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,690.65 : 136,915.20 = 72,758.16 : x
  2. Step 2: Convert to fraction form
    91,690.65/136,915.20 = 72,758.16/x
  3. Step 3: Cross multiply
    91,690.65x = 136,915.20 × 72,758.16
  4. Step 4: Simplify right side
    91,690.65x = 9,961,698,028.03
  5. Step 5: Solve for x
    x = 9,961,698,028.03/91,690.65
  6. Step 6: Final answer
    x = 108,644.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.