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Finding the Fourth Proportional to 803.72, 1,203.46 and 646.70

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Solution

The fourth proportional to 803.72, 1,203.46 and 646.70 is: 968.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.72 : 1,203.46 = 646.70 : x
  2. Step 2: Convert to fraction form
    803.72/1,203.46 = 646.70/x
  3. Step 3: Cross multiply
    803.72x = 1,203.46 × 646.70
  4. Step 4: Simplify right side
    803.72x = 778,278.97
  5. Step 5: Solve for x
    x = 778,278.97/803.72
  6. Step 6: Final answer
    x = 968.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.