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Finding the Fourth Proportional to 452.72, 681.58 and 390.08

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Solution

The fourth proportional to 452.72, 681.58 and 390.08 is: 587.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.72 : 681.58 = 390.08 : x
  2. Step 2: Convert to fraction form
    452.72/681.58 = 390.08/x
  3. Step 3: Cross multiply
    452.72x = 681.58 × 390.08
  4. Step 4: Simplify right side
    452.72x = 265,870.73
  5. Step 5: Solve for x
    x = 265,870.73/452.72
  6. Step 6: Final answer
    x = 587.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.