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Finding the Fourth Proportional to 851.90, 1,175.64 and 478.94

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Solution

The fourth proportional to 851.90, 1,175.64 and 478.94 is: 660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.90 : 1,175.64 = 478.94 : x
  2. Step 2: Convert to fraction form
    851.90/1,175.64 = 478.94/x
  3. Step 3: Cross multiply
    851.90x = 1,175.64 × 478.94
  4. Step 4: Simplify right side
    851.90x = 563,061.02
  5. Step 5: Solve for x
    x = 563,061.02/851.90
  6. Step 6: Final answer
    x = 660.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.