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Finding the Fourth Proportional to 761.51, 1,140.23 and 486.79

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Solution

The fourth proportional to 761.51, 1,140.23 and 486.79 is: 728.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.51 : 1,140.23 = 486.79 : x
  2. Step 2: Convert to fraction form
    761.51/1,140.23 = 486.79/x
  3. Step 3: Cross multiply
    761.51x = 1,140.23 × 486.79
  4. Step 4: Simplify right side
    761.51x = 555,050.93
  5. Step 5: Solve for x
    x = 555,050.93/761.51
  6. Step 6: Final answer
    x = 728.88

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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.