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Finding the Fourth Proportional to 760.20, 1,139.61 and 297.87

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Solution

The fourth proportional to 760.20, 1,139.61 and 297.87 is: 446.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.20 : 1,139.61 = 297.87 : x
  2. Step 2: Convert to fraction form
    760.20/1,139.61 = 297.87/x
  3. Step 3: Cross multiply
    760.20x = 1,139.61 × 297.87
  4. Step 4: Simplify right side
    760.20x = 339,449.93
  5. Step 5: Solve for x
    x = 339,449.93/760.20
  6. Step 6: Final answer
    x = 446.53

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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.