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Finding the Fourth Proportional to 283.47, 390.99 and 172.77

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Solution

The fourth proportional to 283.47, 390.99 and 172.77 is: 238.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.47 : 390.99 = 172.77 : x
  2. Step 2: Convert to fraction form
    283.47/390.99 = 172.77/x
  3. Step 3: Cross multiply
    283.47x = 390.99 × 172.77
  4. Step 4: Simplify right side
    283.47x = 67,551.34
  5. Step 5: Solve for x
    x = 67,551.34/283.47
  6. Step 6: Final answer
    x = 238.30

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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.