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Finding the Fourth Proportional to 889.95, 1,335.51 and 312.82

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Solution

The fourth proportional to 889.95, 1,335.51 and 312.82 is: 469.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.95 : 1,335.51 = 312.82 : x
  2. Step 2: Convert to fraction form
    889.95/1,335.51 = 312.82/x
  3. Step 3: Cross multiply
    889.95x = 1,335.51 × 312.82
  4. Step 4: Simplify right side
    889.95x = 417,774.24
  5. Step 5: Solve for x
    x = 417,774.24/889.95
  6. Step 6: Final answer
    x = 469.44

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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.