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Finding the Fourth Proportional to 945.20, 1,303.80 and 664.94

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Solution

The fourth proportional to 945.20, 1,303.80 and 664.94 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.20 : 1,303.80 = 664.94 : x
  2. Step 2: Convert to fraction form
    945.20/1,303.80 = 664.94/x
  3. Step 3: Cross multiply
    945.20x = 1,303.80 × 664.94
  4. Step 4: Simplify right side
    945.20x = 866,948.77
  5. Step 5: Solve for x
    x = 866,948.77/945.20
  6. Step 6: Final answer
    x = 917.21

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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.