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Finding the Fourth Proportional to 947.15, 1,307.05 and 663.96

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Solution

The fourth proportional to 947.15, 1,307.05 and 663.96 is: 916.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.15 : 1,307.05 = 663.96 : x
  2. Step 2: Convert to fraction form
    947.15/1,307.05 = 663.96/x
  3. Step 3: Cross multiply
    947.15x = 1,307.05 × 663.96
  4. Step 4: Simplify right side
    947.15x = 867,828.92
  5. Step 5: Solve for x
    x = 867,828.92/947.15
  6. Step 6: Final answer
    x = 916.25

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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.