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Finding the Fourth Proportional to 876.36, 1,316.34 and 847.20

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Solution

The fourth proportional to 876.36, 1,316.34 and 847.20 is: 1,272.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.36 : 1,316.34 = 847.20 : x
  2. Step 2: Convert to fraction form
    876.36/1,316.34 = 847.20/x
  3. Step 3: Cross multiply
    876.36x = 1,316.34 × 847.20
  4. Step 4: Simplify right side
    876.36x = 1,115,203.25
  5. Step 5: Solve for x
    x = 1,115,203.25/876.36
  6. Step 6: Final answer
    x = 1,272.54

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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.