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Finding the Fourth Proportional to 1,225.22, 1,830.39 and 875.78

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Solution

The fourth proportional to 1,225.22, 1,830.39 and 875.78 is: 1,308.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.22 : 1,830.39 = 875.78 : x
  2. Step 2: Convert to fraction form
    1,225.22/1,830.39 = 875.78/x
  3. Step 3: Cross multiply
    1,225.22x = 1,830.39 × 875.78
  4. Step 4: Simplify right side
    1,225.22x = 1,603,014.58
  5. Step 5: Solve for x
    x = 1,603,014.58/1,225.22
  6. Step 6: Final answer
    x = 1,308.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.