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Finding the Fourth Proportional to 968.78, 1,336.90 and 526.68

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Solution

The fourth proportional to 968.78, 1,336.90 and 526.68 is: 726.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.78 : 1,336.90 = 526.68 : x
  2. Step 2: Convert to fraction form
    968.78/1,336.90 = 526.68/x
  3. Step 3: Cross multiply
    968.78x = 1,336.90 × 526.68
  4. Step 4: Simplify right side
    968.78x = 704,118.49
  5. Step 5: Solve for x
    x = 704,118.49/968.78
  6. Step 6: Final answer
    x = 726.81

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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.