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Finding the Fourth Proportional to 764.85, 1,055.31 and 555.51

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Solution

The fourth proportional to 764.85, 1,055.31 and 555.51 is: 766.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.85 : 1,055.31 = 555.51 : x
  2. Step 2: Convert to fraction form
    764.85/1,055.31 = 555.51/x
  3. Step 3: Cross multiply
    764.85x = 1,055.31 × 555.51
  4. Step 4: Simplify right side
    764.85x = 586,235.26
  5. Step 5: Solve for x
    x = 586,235.26/764.85
  6. Step 6: Final answer
    x = 766.47

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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.