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Finding the Fourth Proportional to 666, 918.22 and 500.76

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Solution

The fourth proportional to 666, 918.22 and 500.76 is: 690.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    666 : 918.22 = 500.76 : x
  2. Step 2: Convert to fraction form
    666/918.22 = 500.76/x
  3. Step 3: Cross multiply
    666x = 918.22 × 500.76
  4. Step 4: Simplify right side
    666x = 459,807.85
  5. Step 5: Solve for x
    x = 459,807.85/666
  6. Step 6: Final answer
    x = 690.40

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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.