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Finding the Fourth Proportional to 782.18, 1,173.31 and 644.98

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Solution

The fourth proportional to 782.18, 1,173.31 and 644.98 is: 967.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.18 : 1,173.31 = 644.98 : x
  2. Step 2: Convert to fraction form
    782.18/1,173.31 = 644.98/x
  3. Step 3: Cross multiply
    782.18x = 1,173.31 × 644.98
  4. Step 4: Simplify right side
    782.18x = 756,756.00
  5. Step 5: Solve for x
    x = 756,756.00/782.18
  6. Step 6: Final answer
    x = 967.49

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Double scale
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1.5x scale

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.