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Finding the Fourth Proportional to 636.64, 876.61 and 557.51

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Solution

The fourth proportional to 636.64, 876.61 and 557.51 is: 767.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.64 : 876.61 = 557.51 : x
  2. Step 2: Convert to fraction form
    636.64/876.61 = 557.51/x
  3. Step 3: Cross multiply
    636.64x = 876.61 × 557.51
  4. Step 4: Simplify right side
    636.64x = 488,719.64
  5. Step 5: Solve for x
    x = 488,719.64/636.64
  6. Step 6: Final answer
    x = 767.66

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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.