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Finding the Fourth Proportional to 646.39, 891.75 and 425.05

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Solution

The fourth proportional to 646.39, 891.75 and 425.05 is: 586.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.39 : 891.75 = 425.05 : x
  2. Step 2: Convert to fraction form
    646.39/891.75 = 425.05/x
  3. Step 3: Cross multiply
    646.39x = 891.75 × 425.05
  4. Step 4: Simplify right side
    646.39x = 379,038.34
  5. Step 5: Solve for x
    x = 379,038.34/646.39
  6. Step 6: Final answer
    x = 586.39

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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.