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Finding the Fourth Proportional to 759.61, 1,139.42 and 485.83

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Solution

The fourth proportional to 759.61, 1,139.42 and 485.83 is: 728.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.61 : 1,139.42 = 485.83 : x
  2. Step 2: Convert to fraction form
    759.61/1,139.42 = 485.83/x
  3. Step 3: Cross multiply
    759.61x = 1,139.42 × 485.83
  4. Step 4: Simplify right side
    759.61x = 553,561.99
  5. Step 5: Solve for x
    x = 553,561.99/759.61
  6. Step 6: Final answer
    x = 728.75

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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.