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Finding the Fourth Proportional to 480.61, 720.88 and 172.45

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Solution

The fourth proportional to 480.61, 720.88 and 172.45 is: 258.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.61 : 720.88 = 172.45 : x
  2. Step 2: Convert to fraction form
    480.61/720.88 = 172.45/x
  3. Step 3: Cross multiply
    480.61x = 720.88 × 172.45
  4. Step 4: Simplify right side
    480.61x = 124,312.15
  5. Step 5: Solve for x
    x = 124,312.15/480.61
  6. Step 6: Final answer
    x = 258.65

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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.