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Finding the Fourth Proportional to 646.28, 891.34 and 425.45

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Solution

The fourth proportional to 646.28, 891.34 and 425.45 is: 586.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.28 : 891.34 = 425.45 : x
  2. Step 2: Convert to fraction form
    646.28/891.34 = 425.45/x
  3. Step 3: Cross multiply
    646.28x = 891.34 × 425.45
  4. Step 4: Simplify right side
    646.28x = 379,220.60
  5. Step 5: Solve for x
    x = 379,220.60/646.28
  6. Step 6: Final answer
    x = 586.77

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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.