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Finding the Fourth Proportional to 786.26, 1,085.12 and 475.76

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Solution

The fourth proportional to 786.26, 1,085.12 and 475.76 is: 656.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.26 : 1,085.12 = 475.76 : x
  2. Step 2: Convert to fraction form
    786.26/1,085.12 = 475.76/x
  3. Step 3: Cross multiply
    786.26x = 1,085.12 × 475.76
  4. Step 4: Simplify right side
    786.26x = 516,256.69
  5. Step 5: Solve for x
    x = 516,256.69/786.26
  6. Step 6: Final answer
    x = 656.60

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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.