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Finding the Fourth Proportional to 764.56, 1,054.86 and 469.64

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Solution

The fourth proportional to 764.56, 1,054.86 and 469.64 is: 647.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.56 : 1,054.86 = 469.64 : x
  2. Step 2: Convert to fraction form
    764.56/1,054.86 = 469.64/x
  3. Step 3: Cross multiply
    764.56x = 1,054.86 × 469.64
  4. Step 4: Simplify right side
    764.56x = 495,404.45
  5. Step 5: Solve for x
    x = 495,404.45/764.56
  6. Step 6: Final answer
    x = 647.96

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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.