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Finding the Fourth Proportional to 487.58, 672.45 and 400.10

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Solution

The fourth proportional to 487.58, 672.45 and 400.10 is: 551.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.58 : 672.45 = 400.10 : x
  2. Step 2: Convert to fraction form
    487.58/672.45 = 400.10/x
  3. Step 3: Cross multiply
    487.58x = 672.45 × 400.10
  4. Step 4: Simplify right side
    487.58x = 269,047.25
  5. Step 5: Solve for x
    x = 269,047.25/487.58
  6. Step 6: Final answer
    x = 551.80

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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.