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Finding the Fourth Proportional to 407.64, 607.20 and 406.20

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Solution

The fourth proportional to 407.64, 607.20 and 406.20 is: 605.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.64 : 607.20 = 406.20 : x
  2. Step 2: Convert to fraction form
    407.64/607.20 = 406.20/x
  3. Step 3: Cross multiply
    407.64x = 607.20 × 406.20
  4. Step 4: Simplify right side
    407.64x = 246,644.64
  5. Step 5: Solve for x
    x = 246,644.64/407.64
  6. Step 6: Final answer
    x = 605.06

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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.