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Finding the Fourth Proportional to 914.34, 1,261.80 and 521.60

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Solution

The fourth proportional to 914.34, 1,261.80 and 521.60 is: 719.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.34 : 1,261.80 = 521.60 : x
  2. Step 2: Convert to fraction form
    914.34/1,261.80 = 521.60/x
  3. Step 3: Cross multiply
    914.34x = 1,261.80 × 521.60
  4. Step 4: Simplify right side
    914.34x = 658,148.57
  5. Step 5: Solve for x
    x = 658,148.57/914.34
  6. Step 6: Final answer
    x = 719.80

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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.