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Finding the Fourth Proportional to 442.58, 659.79 and 407.90

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Solution

The fourth proportional to 442.58, 659.79 and 407.90 is: 608.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.58 : 659.79 = 407.90 : x
  2. Step 2: Convert to fraction form
    442.58/659.79 = 407.90/x
  3. Step 3: Cross multiply
    442.58x = 659.79 × 407.90
  4. Step 4: Simplify right side
    442.58x = 269,129.99
  5. Step 5: Solve for x
    x = 269,129.99/442.58
  6. Step 6: Final answer
    x = 608.10

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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.