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Finding the Fourth Proportional to 315.61, 473.42 and 172.24

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Solution

The fourth proportional to 315.61, 473.42 and 172.24 is: 258.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.61 : 473.42 = 172.24 : x
  2. Step 2: Convert to fraction form
    315.61/473.42 = 172.24/x
  3. Step 3: Cross multiply
    315.61x = 473.42 × 172.24
  4. Step 4: Simplify right side
    315.61x = 81,541.86
  5. Step 5: Solve for x
    x = 81,541.86/315.61
  6. Step 6: Final answer
    x = 258.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.