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Finding the Fourth Proportional to 7,449.78, 10,280.64 and 4,137.78

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Solution

The fourth proportional to 7,449.78, 10,280.64 and 4,137.78 is: 5,710.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,449.78 : 10,280.64 = 4,137.78 : x
  2. Step 2: Convert to fraction form
    7,449.78/10,280.64 = 4,137.78/x
  3. Step 3: Cross multiply
    7,449.78x = 10,280.64 × 4,137.78
  4. Step 4: Simplify right side
    7,449.78x = 42,539,026.58
  5. Step 5: Solve for x
    x = 42,539,026.58/7,449.78
  6. Step 6: Final answer
    x = 5,710.11

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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.