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Finding the Fourth Proportional to 3,641.78, 5,025.66 and 1,985.78

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Solution

The fourth proportional to 3,641.78, 5,025.66 and 1,985.78 is: 2,740.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,641.78 : 5,025.66 = 1,985.78 : x
  2. Step 2: Convert to fraction form
    3,641.78/5,025.66 = 1,985.78/x
  3. Step 3: Cross multiply
    3,641.78x = 5,025.66 × 1,985.78
  4. Step 4: Simplify right side
    3,641.78x = 9,979,855.11
  5. Step 5: Solve for x
    x = 9,979,855.11/3,641.78
  6. Step 6: Final answer
    x = 2,740.38

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Double scale
Find fourth proportional to 3,642.78, 5,027.04 and 1,986.78
Similar ratio
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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.