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Finding the Fourth Proportional to 761.52, 1,140.72 and 486.93

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Solution

The fourth proportional to 761.52, 1,140.72 and 486.93 is: 729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.52 : 1,140.72 = 486.93 : x
  2. Step 2: Convert to fraction form
    761.52/1,140.72 = 486.93/x
  3. Step 3: Cross multiply
    761.52x = 1,140.72 × 486.93
  4. Step 4: Simplify right side
    761.52x = 555,450.79
  5. Step 5: Solve for x
    x = 555,450.79/761.52
  6. Step 6: Final answer
    x = 729.40

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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.