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Finding the Fourth Proportional to 947.18, 1,307.31 and 636.50

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Solution

The fourth proportional to 947.18, 1,307.31 and 636.50 is: 878.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.18 : 1,307.31 = 636.50 : x
  2. Step 2: Convert to fraction form
    947.18/1,307.31 = 636.50/x
  3. Step 3: Cross multiply
    947.18x = 1,307.31 × 636.50
  4. Step 4: Simplify right side
    947.18x = 832,102.82
  5. Step 5: Solve for x
    x = 832,102.82/947.18
  6. Step 6: Final answer
    x = 878.51

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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.