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Finding the Fourth Proportional to 3,106.67, 4,658.40 and 915.12

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Solution

The fourth proportional to 3,106.67, 4,658.40 and 915.12 is: 1,372.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,106.67 : 4,658.40 = 915.12 : x
  2. Step 2: Convert to fraction form
    3,106.67/4,658.40 = 915.12/x
  3. Step 3: Cross multiply
    3,106.67x = 4,658.40 × 915.12
  4. Step 4: Simplify right side
    3,106.67x = 4,262,995.01
  5. Step 5: Solve for x
    x = 4,262,995.01/3,106.67
  6. Step 6: Final answer
    x = 1,372.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.