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Finding the Fourth Proportional to 890.36, 1,335.64 and 478.92

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Solution

The fourth proportional to 890.36, 1,335.64 and 478.92 is: 718.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.36 : 1,335.64 = 478.92 : x
  2. Step 2: Convert to fraction form
    890.36/1,335.64 = 478.92/x
  3. Step 3: Cross multiply
    890.36x = 1,335.64 × 478.92
  4. Step 4: Simplify right side
    890.36x = 639,664.71
  5. Step 5: Solve for x
    x = 639,664.71/890.36
  6. Step 6: Final answer
    x = 718.43

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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.