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Finding the Fourth Proportional to 764.62, 1,054.54 and 666.20

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Solution

The fourth proportional to 764.62, 1,054.54 and 666.20 is: 918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.62 : 1,054.54 = 666.20 : x
  2. Step 2: Convert to fraction form
    764.62/1,054.54 = 666.20/x
  3. Step 3: Cross multiply
    764.62x = 1,054.54 × 666.20
  4. Step 4: Simplify right side
    764.62x = 702,534.55
  5. Step 5: Solve for x
    x = 702,534.55/764.62
  6. Step 6: Final answer
    x = 918.80

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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.