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Finding the Fourth Proportional to 775.74, 1,070.10 and 666.66

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Solution

The fourth proportional to 775.74, 1,070.10 and 666.66 is: 919.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.74 : 1,070.10 = 666.66 : x
  2. Step 2: Convert to fraction form
    775.74/1,070.10 = 666.66/x
  3. Step 3: Cross multiply
    775.74x = 1,070.10 × 666.66
  4. Step 4: Simplify right side
    775.74x = 713,392.87
  5. Step 5: Solve for x
    x = 713,392.87/775.74
  6. Step 6: Final answer
    x = 919.63

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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.