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Finding the Fourth Proportional to 947.90, 1,308.08 and 616.98

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Solution

The fourth proportional to 947.90, 1,308.08 and 616.98 is: 851.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.90 : 1,308.08 = 616.98 : x
  2. Step 2: Convert to fraction form
    947.90/1,308.08 = 616.98/x
  3. Step 3: Cross multiply
    947.90x = 1,308.08 × 616.98
  4. Step 4: Simplify right side
    947.90x = 807,056.11
  5. Step 5: Solve for x
    x = 807,056.11/947.90
  6. Step 6: Final answer
    x = 851.42

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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.