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Finding the Fourth Proportional to 687.59, 948.97 and 666.07

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Solution

The fourth proportional to 687.59, 948.97 and 666.07 is: 919.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.59 : 948.97 = 666.07 : x
  2. Step 2: Convert to fraction form
    687.59/948.97 = 666.07/x
  3. Step 3: Cross multiply
    687.59x = 948.97 × 666.07
  4. Step 4: Simplify right side
    687.59x = 632,080.50
  5. Step 5: Solve for x
    x = 632,080.50/687.59
  6. Step 6: Final answer
    x = 919.27

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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.