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Finding the Fourth Proportional to 772.34, 1,064.16 and 645.86

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Solution

The fourth proportional to 772.34, 1,064.16 and 645.86 is: 889.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.34 : 1,064.16 = 645.86 : x
  2. Step 2: Convert to fraction form
    772.34/1,064.16 = 645.86/x
  3. Step 3: Cross multiply
    772.34x = 1,064.16 × 645.86
  4. Step 4: Simplify right side
    772.34x = 687,298.38
  5. Step 5: Solve for x
    x = 687,298.38/772.34
  6. Step 6: Final answer
    x = 889.89

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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.