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Finding the Fourth Proportional to 666.77, 918.11 and 627.80

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Solution

The fourth proportional to 666.77, 918.11 and 627.80 is: 864.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.77 : 918.11 = 627.80 : x
  2. Step 2: Convert to fraction form
    666.77/918.11 = 627.80/x
  3. Step 3: Cross multiply
    666.77x = 918.11 × 627.80
  4. Step 4: Simplify right side
    666.77x = 576,386.44
  5. Step 5: Solve for x
    x = 576,386.44/666.77
  6. Step 6: Final answer
    x = 864.45

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Double scale
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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.