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Finding the Fourth Proportional to 690.50, 1,035.54 and 257.60

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Solution

The fourth proportional to 690.50, 1,035.54 and 257.60 is: 386.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.50 : 1,035.54 = 257.60 : x
  2. Step 2: Convert to fraction form
    690.50/1,035.54 = 257.60/x
  3. Step 3: Cross multiply
    690.50x = 1,035.54 × 257.60
  4. Step 4: Simplify right side
    690.50x = 266,755.10
  5. Step 5: Solve for x
    x = 266,755.10/690.50
  6. Step 6: Final answer
    x = 386.32

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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.