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Finding the Fourth Proportional to 889.84, 1,334.78 and 312.72

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Solution

The fourth proportional to 889.84, 1,334.78 and 312.72 is: 469.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.84 : 1,334.78 = 312.72 : x
  2. Step 2: Convert to fraction form
    889.84/1,334.78 = 312.72/x
  3. Step 3: Cross multiply
    889.84x = 1,334.78 × 312.72
  4. Step 4: Simplify right side
    889.84x = 417,412.40
  5. Step 5: Solve for x
    x = 417,412.40/889.84
  6. Step 6: Final answer
    x = 469.09

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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.