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Finding the Fourth Proportional to 968.75, 1,453.80 and 391.63

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Solution

The fourth proportional to 968.75, 1,453.80 and 391.63 is: 587.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.75 : 1,453.80 = 391.63 : x
  2. Step 2: Convert to fraction form
    968.75/1,453.80 = 391.63/x
  3. Step 3: Cross multiply
    968.75x = 1,453.80 × 391.63
  4. Step 4: Simplify right side
    968.75x = 569,351.69
  5. Step 5: Solve for x
    x = 569,351.69/968.75
  6. Step 6: Final answer
    x = 587.72

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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.