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Finding the Fourth Proportional to 918.74, 1,378.57 and 456.50

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Solution

The fourth proportional to 918.74, 1,378.57 and 456.50 is: 684.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,378.57 = 456.50 : x
  2. Step 2: Convert to fraction form
    918.74/1,378.57 = 456.50/x
  3. Step 3: Cross multiply
    918.74x = 1,378.57 × 456.50
  4. Step 4: Simplify right side
    918.74x = 629,317.21
  5. Step 5: Solve for x
    x = 629,317.21/918.74
  6. Step 6: Final answer
    x = 684.98

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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.