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Finding the Fourth Proportional to 879.47, 1,319.39 and 417.30

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Solution

The fourth proportional to 879.47, 1,319.39 and 417.30 is: 626.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.47 : 1,319.39 = 417.30 : x
  2. Step 2: Convert to fraction form
    879.47/1,319.39 = 417.30/x
  3. Step 3: Cross multiply
    879.47x = 1,319.39 × 417.30
  4. Step 4: Simplify right side
    879.47x = 550,583.40
  5. Step 5: Solve for x
    x = 550,583.40/879.47
  6. Step 6: Final answer
    x = 626.04

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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.