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Finding the Fourth Proportional to 759.72, 1,048.91 and 465.15

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Solution

The fourth proportional to 759.72, 1,048.91 and 465.15 is: 642.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.72 : 1,048.91 = 465.15 : x
  2. Step 2: Convert to fraction form
    759.72/1,048.91 = 465.15/x
  3. Step 3: Cross multiply
    759.72x = 1,048.91 × 465.15
  4. Step 4: Simplify right side
    759.72x = 487,898.16
  5. Step 5: Solve for x
    x = 487,898.16/759.72
  6. Step 6: Final answer
    x = 642.21

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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.