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Finding the Fourth Proportional to 760.79, 1,140.86 and 240.66

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Solution

The fourth proportional to 760.79, 1,140.86 and 240.66 is: 360.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.79 : 1,140.86 = 240.66 : x
  2. Step 2: Convert to fraction form
    760.79/1,140.86 = 240.66/x
  3. Step 3: Cross multiply
    760.79x = 1,140.86 × 240.66
  4. Step 4: Simplify right side
    760.79x = 274,558.16
  5. Step 5: Solve for x
    x = 274,558.16/760.79
  6. Step 6: Final answer
    x = 360.89

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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.