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Finding the Fourth Proportional to 2,603.78, 3,905.22 and 872.40

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Solution

The fourth proportional to 2,603.78, 3,905.22 and 872.40 is: 1,308.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,603.78 : 3,905.22 = 872.40 : x
  2. Step 2: Convert to fraction form
    2,603.78/3,905.22 = 872.40/x
  3. Step 3: Cross multiply
    2,603.78x = 3,905.22 × 872.40
  4. Step 4: Simplify right side
    2,603.78x = 3,406,913.93
  5. Step 5: Solve for x
    x = 3,406,913.93/2,603.78
  6. Step 6: Final answer
    x = 1,308.45

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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.