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Finding the Fourth Proportional to 3,915.95, 5,387.77 and 3,419.77

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Solution

The fourth proportional to 3,915.95, 5,387.77 and 3,419.77 is: 4,705.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.95 : 5,387.77 = 3,419.77 : x
  2. Step 2: Convert to fraction form
    3,915.95/5,387.77 = 3,419.77/x
  3. Step 3: Cross multiply
    3,915.95x = 5,387.77 × 3,419.77
  4. Step 4: Simplify right side
    3,915.95x = 18,424,915.88
  5. Step 5: Solve for x
    x = 18,424,915.88/3,915.95
  6. Step 6: Final answer
    x = 4,705.10

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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.