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Finding the Fourth Proportional to 764.69, 1,055.30 and 470.05

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Solution

The fourth proportional to 764.69, 1,055.30 and 470.05 is: 648.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.69 : 1,055.30 = 470.05 : x
  2. Step 2: Convert to fraction form
    764.69/1,055.30 = 470.05/x
  3. Step 3: Cross multiply
    764.69x = 1,055.30 × 470.05
  4. Step 4: Simplify right side
    764.69x = 496,048.68
  5. Step 5: Solve for x
    x = 496,048.68/764.69
  6. Step 6: Final answer
    x = 648.69

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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.