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Finding the Fourth Proportional to 431.53, 646.04 and 387.02

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Solution

The fourth proportional to 431.53, 646.04 and 387.02 is: 579.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.53 : 646.04 = 387.02 : x
  2. Step 2: Convert to fraction form
    431.53/646.04 = 387.02/x
  3. Step 3: Cross multiply
    431.53x = 646.04 × 387.02
  4. Step 4: Simplify right side
    431.53x = 250,032.98
  5. Step 5: Solve for x
    x = 250,032.98/431.53
  6. Step 6: Final answer
    x = 579.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.