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Finding the Fourth Proportional to 764.49, 1,054.37 and 666.08

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Solution

The fourth proportional to 764.49, 1,054.37 and 666.08 is: 918.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.49 : 1,054.37 = 666.08 : x
  2. Step 2: Convert to fraction form
    764.49/1,054.37 = 666.08/x
  3. Step 3: Cross multiply
    764.49x = 1,054.37 × 666.08
  4. Step 4: Simplify right side
    764.49x = 702,294.77
  5. Step 5: Solve for x
    x = 702,294.77/764.49
  6. Step 6: Final answer
    x = 918.64

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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.