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Finding the Fourth Proportional to 646.49, 891.69 and 625.07

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Solution

The fourth proportional to 646.49, 891.69 and 625.07 is: 862.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.49 : 891.69 = 625.07 : x
  2. Step 2: Convert to fraction form
    646.49/891.69 = 625.07/x
  3. Step 3: Cross multiply
    646.49x = 891.69 × 625.07
  4. Step 4: Simplify right side
    646.49x = 557,368.67
  5. Step 5: Solve for x
    x = 557,368.67/646.49
  6. Step 6: Final answer
    x = 862.15

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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.