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Finding the Fourth Proportional to 889.87, 1,335.41 and 312.74

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Solution

The fourth proportional to 889.87, 1,335.41 and 312.74 is: 469.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.87 : 1,335.41 = 312.74 : x
  2. Step 2: Convert to fraction form
    889.87/1,335.41 = 312.74/x
  3. Step 3: Cross multiply
    889.87x = 1,335.41 × 312.74
  4. Step 4: Simplify right side
    889.87x = 417,636.12
  5. Step 5: Solve for x
    x = 417,636.12/889.87
  6. Step 6: Final answer
    x = 469.32

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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.