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Finding the Fourth Proportional to 760.14, 1,138.68 and 637.74

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Solution

The fourth proportional to 760.14, 1,138.68 and 637.74 is: 955.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.14 : 1,138.68 = 637.74 : x
  2. Step 2: Convert to fraction form
    760.14/1,138.68 = 637.74/x
  3. Step 3: Cross multiply
    760.14x = 1,138.68 × 637.74
  4. Step 4: Simplify right side
    760.14x = 726,181.78
  5. Step 5: Solve for x
    x = 726,181.78/760.14
  6. Step 6: Final answer
    x = 955.33

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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.