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Finding the Fourth Proportional to 890.24, 1,335.02 and 427.91

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Solution

The fourth proportional to 890.24, 1,335.02 and 427.91 is: 641.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.24 : 1,335.02 = 427.91 : x
  2. Step 2: Convert to fraction form
    890.24/1,335.02 = 427.91/x
  3. Step 3: Cross multiply
    890.24x = 1,335.02 × 427.91
  4. Step 4: Simplify right side
    890.24x = 571,259.59
  5. Step 5: Solve for x
    x = 571,259.59/890.24
  6. Step 6: Final answer
    x = 641.70

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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.