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Finding the Fourth Proportional to 759.13, 1,139.53 and 485.45

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Solution

The fourth proportional to 759.13, 1,139.53 and 485.45 is: 728.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.13 : 1,139.53 = 485.45 : x
  2. Step 2: Convert to fraction form
    759.13/1,139.53 = 485.45/x
  3. Step 3: Cross multiply
    759.13x = 1,139.53 × 485.45
  4. Step 4: Simplify right side
    759.13x = 553,186.47
  5. Step 5: Solve for x
    x = 553,186.47/759.13
  6. Step 6: Final answer
    x = 728.71

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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.