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Finding the Fourth Proportional to 4,290.78, 6,436.20 and 1,369.20

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Solution

The fourth proportional to 4,290.78, 6,436.20 and 1,369.20 is: 2,053.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,290.78 : 6,436.20 = 1,369.20 : x
  2. Step 2: Convert to fraction form
    4,290.78/6,436.20 = 1,369.20/x
  3. Step 3: Cross multiply
    4,290.78x = 6,436.20 × 1,369.20
  4. Step 4: Simplify right side
    4,290.78x = 8,812,445.04
  5. Step 5: Solve for x
    x = 8,812,445.04/4,290.78
  6. Step 6: Final answer
    x = 2,053.81

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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.