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Finding the Fourth Proportional to 955.96, 1,319.70 and 647.08

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Solution

The fourth proportional to 955.96, 1,319.70 and 647.08 is: 893.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.96 : 1,319.70 = 647.08 : x
  2. Step 2: Convert to fraction form
    955.96/1,319.70 = 647.08/x
  3. Step 3: Cross multiply
    955.96x = 1,319.70 × 647.08
  4. Step 4: Simplify right side
    955.96x = 853,951.48
  5. Step 5: Solve for x
    x = 853,951.48/955.96
  6. Step 6: Final answer
    x = 893.29

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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.