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Finding the Fourth Proportional to 760.50, 1,140.66 and 321.87

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Solution

The fourth proportional to 760.50, 1,140.66 and 321.87 is: 482.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.50 : 1,140.66 = 321.87 : x
  2. Step 2: Convert to fraction form
    760.50/1,140.66 = 321.87/x
  3. Step 3: Cross multiply
    760.50x = 1,140.66 × 321.87
  4. Step 4: Simplify right side
    760.50x = 367,144.23
  5. Step 5: Solve for x
    x = 367,144.23/760.50
  6. Step 6: Final answer
    x = 482.77

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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.