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Finding the Fourth Proportional to 889.91, 1,335.02 and 428.52

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Solution

The fourth proportional to 889.91, 1,335.02 and 428.52 is: 642.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.91 : 1,335.02 = 428.52 : x
  2. Step 2: Convert to fraction form
    889.91/1,335.02 = 428.52/x
  3. Step 3: Cross multiply
    889.91x = 1,335.02 × 428.52
  4. Step 4: Simplify right side
    889.91x = 572,080.63
  5. Step 5: Solve for x
    x = 572,080.63/889.91
  6. Step 6: Final answer
    x = 642.86

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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.