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Finding the Fourth Proportional to 687.50, 1,030.40 and 610.60

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Solution

The fourth proportional to 687.50, 1,030.40 and 610.60 is: 915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.50 : 1,030.40 = 610.60 : x
  2. Step 2: Convert to fraction form
    687.50/1,030.40 = 610.60/x
  3. Step 3: Cross multiply
    687.50x = 1,030.40 × 610.60
  4. Step 4: Simplify right side
    687.50x = 629,162.24
  5. Step 5: Solve for x
    x = 629,162.24/687.50
  6. Step 6: Final answer
    x = 915.15

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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.