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Finding the Fourth Proportional to 764.87, 1,055.43 and 470.30

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Solution

The fourth proportional to 764.87, 1,055.43 and 470.30 is: 648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.87 : 1,055.43 = 470.30 : x
  2. Step 2: Convert to fraction form
    764.87/1,055.43 = 470.30/x
  3. Step 3: Cross multiply
    764.87x = 1,055.43 × 470.30
  4. Step 4: Simplify right side
    764.87x = 496,363.45
  5. Step 5: Solve for x
    x = 496,363.45/764.87
  6. Step 6: Final answer
    x = 648.96

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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.