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Finding the Fourth Proportional to 666.51, 919.88 and 500.43

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Solution

The fourth proportional to 666.51, 919.88 and 500.43 is: 690.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.51 : 919.88 = 500.43 : x
  2. Step 2: Convert to fraction form
    666.51/919.88 = 500.43/x
  3. Step 3: Cross multiply
    666.51x = 919.88 × 500.43
  4. Step 4: Simplify right side
    666.51x = 460,333.05
  5. Step 5: Solve for x
    x = 460,333.05/666.51
  6. Step 6: Final answer
    x = 690.66

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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.