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Finding the Fourth Proportional to 612.24, 918.04 and 438.80

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Solution

The fourth proportional to 612.24, 918.04 and 438.80 is: 657.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.24 : 918.04 = 438.80 : x
  2. Step 2: Convert to fraction form
    612.24/918.04 = 438.80/x
  3. Step 3: Cross multiply
    612.24x = 918.04 × 438.80
  4. Step 4: Simplify right side
    612.24x = 402,835.95
  5. Step 5: Solve for x
    x = 402,835.95/612.24
  6. Step 6: Final answer
    x = 657.97

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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.