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Finding the Fourth Proportional to 666.71, 919.39 and 556.15

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Solution

The fourth proportional to 666.71, 919.39 and 556.15 is: 766.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.71 : 919.39 = 556.15 : x
  2. Step 2: Convert to fraction form
    666.71/919.39 = 556.15/x
  3. Step 3: Cross multiply
    666.71x = 919.39 × 556.15
  4. Step 4: Simplify right side
    666.71x = 511,318.75
  5. Step 5: Solve for x
    x = 511,318.75/666.71
  6. Step 6: Final answer
    x = 766.93

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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.