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Finding the Fourth Proportional to 666.63, 1,003.77 and 485.28

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Solution

The fourth proportional to 666.63, 1,003.77 and 485.28 is: 730.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.63 : 1,003.77 = 485.28 : x
  2. Step 2: Convert to fraction form
    666.63/1,003.77 = 485.28/x
  3. Step 3: Cross multiply
    666.63x = 1,003.77 × 485.28
  4. Step 4: Simplify right side
    666.63x = 487,109.51
  5. Step 5: Solve for x
    x = 487,109.51/666.63
  6. Step 6: Final answer
    x = 730.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.