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Finding the Fourth Proportional to 760.67, 1,140.90 and 298.13

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Solution

The fourth proportional to 760.67, 1,140.90 and 298.13 is: 447.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.67 : 1,140.90 = 298.13 : x
  2. Step 2: Convert to fraction form
    760.67/1,140.90 = 298.13/x
  3. Step 3: Cross multiply
    760.67x = 1,140.90 × 298.13
  4. Step 4: Simplify right side
    760.67x = 340,136.52
  5. Step 5: Solve for x
    x = 340,136.52/760.67
  6. Step 6: Final answer
    x = 447.15

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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.