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Finding the Fourth Proportional to 762.45, 1,051.71 and 638.73

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Solution

The fourth proportional to 762.45, 1,051.71 and 638.73 is: 881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.45 : 1,051.71 = 638.73 : x
  2. Step 2: Convert to fraction form
    762.45/1,051.71 = 638.73/x
  3. Step 3: Cross multiply
    762.45x = 1,051.71 × 638.73
  4. Step 4: Simplify right side
    762.45x = 671,758.73
  5. Step 5: Solve for x
    x = 671,758.73/762.45
  6. Step 6: Final answer
    x = 881.05

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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.