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Finding the Fourth Proportional to 772.16, 1,065.62 and 477.60

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Solution

The fourth proportional to 772.16, 1,065.62 and 477.60 is: 659.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.16 : 1,065.62 = 477.60 : x
  2. Step 2: Convert to fraction form
    772.16/1,065.62 = 477.60/x
  3. Step 3: Cross multiply
    772.16x = 1,065.62 × 477.60
  4. Step 4: Simplify right side
    772.16x = 508,940.11
  5. Step 5: Solve for x
    x = 508,940.11/772.16
  6. Step 6: Final answer
    x = 659.11

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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.