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Finding the Fourth Proportional to 457.02, 681.66 and 431.28

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Solution

The fourth proportional to 457.02, 681.66 and 431.28 is: 643.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.02 : 681.66 = 431.28 : x
  2. Step 2: Convert to fraction form
    457.02/681.66 = 431.28/x
  3. Step 3: Cross multiply
    457.02x = 681.66 × 431.28
  4. Step 4: Simplify right side
    457.02x = 293,986.32
  5. Step 5: Solve for x
    x = 293,986.32/457.02
  6. Step 6: Final answer
    x = 643.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.