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Finding the Fourth Proportional to 760.69, 1,140.30 and 298.31

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Solution

The fourth proportional to 760.69, 1,140.30 and 298.31 is: 447.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.69 : 1,140.30 = 298.31 : x
  2. Step 2: Convert to fraction form
    760.69/1,140.30 = 298.31/x
  3. Step 3: Cross multiply
    760.69x = 1,140.30 × 298.31
  4. Step 4: Simplify right side
    760.69x = 340,162.89
  5. Step 5: Solve for x
    x = 340,162.89/760.69
  6. Step 6: Final answer
    x = 447.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.