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Finding the Fourth Proportional to 666.66, 919.65 and 619.77

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Solution

The fourth proportional to 666.66, 919.65 and 619.77 is: 854.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.66 : 919.65 = 619.77 : x
  2. Step 2: Convert to fraction form
    666.66/919.65 = 619.77/x
  3. Step 3: Cross multiply
    666.66x = 919.65 × 619.77
  4. Step 4: Simplify right side
    666.66x = 569,971.48
  5. Step 5: Solve for x
    x = 569,971.48/666.66
  6. Step 6: Final answer
    x = 854.97

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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.