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Finding the Fourth Proportional to 851.61, 1,277.65 and 486.66

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Solution

The fourth proportional to 851.61, 1,277.65 and 486.66 is: 730.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.61 : 1,277.65 = 486.66 : x
  2. Step 2: Convert to fraction form
    851.61/1,277.65 = 486.66/x
  3. Step 3: Cross multiply
    851.61x = 1,277.65 × 486.66
  4. Step 4: Simplify right side
    851.61x = 621,777.99
  5. Step 5: Solve for x
    x = 621,777.99/851.61
  6. Step 6: Final answer
    x = 730.12

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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.