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Finding the Fourth Proportional to 772.15, 1,065.75 and 477.64

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Solution

The fourth proportional to 772.15, 1,065.75 and 477.64 is: 659.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.15 : 1,065.75 = 477.64 : x
  2. Step 2: Convert to fraction form
    772.15/1,065.75 = 477.64/x
  3. Step 3: Cross multiply
    772.15x = 1,065.75 × 477.64
  4. Step 4: Simplify right side
    772.15x = 509,044.83
  5. Step 5: Solve for x
    x = 509,044.83/772.15
  6. Step 6: Final answer
    x = 659.26

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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.