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Finding the Fourth Proportional to 665.70, 918.72 and 386.02

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Solution

The fourth proportional to 665.70, 918.72 and 386.02 is: 532.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.70 : 918.72 = 386.02 : x
  2. Step 2: Convert to fraction form
    665.70/918.72 = 386.02/x
  3. Step 3: Cross multiply
    665.70x = 918.72 × 386.02
  4. Step 4: Simplify right side
    665.70x = 354,644.29
  5. Step 5: Solve for x
    x = 354,644.29/665.70
  6. Step 6: Final answer
    x = 532.74

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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.