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Finding the Fourth Proportional to 666.74, 918.18 and 664.71

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Solution

The fourth proportional to 666.74, 918.18 and 664.71 is: 915.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.74 : 918.18 = 664.71 : x
  2. Step 2: Convert to fraction form
    666.74/918.18 = 664.71/x
  3. Step 3: Cross multiply
    666.74x = 918.18 × 664.71
  4. Step 4: Simplify right side
    666.74x = 610,323.43
  5. Step 5: Solve for x
    x = 610,323.43/666.74
  6. Step 6: Final answer
    x = 915.39

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1.5x scale

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.