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Finding the Fourth Proportional to 764.69, 1,054.95 and 515.58

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Solution

The fourth proportional to 764.69, 1,054.95 and 515.58 is: 711.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.69 : 1,054.95 = 515.58 : x
  2. Step 2: Convert to fraction form
    764.69/1,054.95 = 515.58/x
  3. Step 3: Cross multiply
    764.69x = 1,054.95 × 515.58
  4. Step 4: Simplify right side
    764.69x = 543,911.12
  5. Step 5: Solve for x
    x = 543,911.12/764.69
  6. Step 6: Final answer
    x = 711.29

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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.