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Finding the Fourth Proportional to 761.61, 1,050.74 and 499.98

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Solution

The fourth proportional to 761.61, 1,050.74 and 499.98 is: 689.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.61 : 1,050.74 = 499.98 : x
  2. Step 2: Convert to fraction form
    761.61/1,050.74 = 499.98/x
  3. Step 3: Cross multiply
    761.61x = 1,050.74 × 499.98
  4. Step 4: Simplify right side
    761.61x = 525,348.99
  5. Step 5: Solve for x
    x = 525,348.99/761.61
  6. Step 6: Final answer
    x = 689.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.