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Finding the Fourth Proportional to 646.05, 891.63 and 469.58

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Solution

The fourth proportional to 646.05, 891.63 and 469.58 is: 648.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.05 : 891.63 = 469.58 : x
  2. Step 2: Convert to fraction form
    646.05/891.63 = 469.58/x
  3. Step 3: Cross multiply
    646.05x = 891.63 × 469.58
  4. Step 4: Simplify right side
    646.05x = 418,693.84
  5. Step 5: Solve for x
    x = 418,693.84/646.05
  6. Step 6: Final answer
    x = 648.08

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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.