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Finding the Fourth Proportional to 643.21, 887.93 and 410.47

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Solution

The fourth proportional to 643.21, 887.93 and 410.47 is: 566.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.21 : 887.93 = 410.47 : x
  2. Step 2: Convert to fraction form
    643.21/887.93 = 410.47/x
  3. Step 3: Cross multiply
    643.21x = 887.93 × 410.47
  4. Step 4: Simplify right side
    643.21x = 364,465.89
  5. Step 5: Solve for x
    x = 364,465.89/643.21
  6. Step 6: Final answer
    x = 566.64

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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.