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Finding the Fourth Proportional to 611.34, 917.03 and 172.59

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Solution

The fourth proportional to 611.34, 917.03 and 172.59 is: 258.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.34 : 917.03 = 172.59 : x
  2. Step 2: Convert to fraction form
    611.34/917.03 = 172.59/x
  3. Step 3: Cross multiply
    611.34x = 917.03 × 172.59
  4. Step 4: Simplify right side
    611.34x = 158,271.71
  5. Step 5: Solve for x
    x = 158,271.71/611.34
  6. Step 6: Final answer
    x = 258.89

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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.