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Finding the Fourth Proportional to 612.95, 918.36 and 429.99

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Solution

The fourth proportional to 612.95, 918.36 and 429.99 is: 644.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.95 : 918.36 = 429.99 : x
  2. Step 2: Convert to fraction form
    612.95/918.36 = 429.99/x
  3. Step 3: Cross multiply
    612.95x = 918.36 × 429.99
  4. Step 4: Simplify right side
    612.95x = 394,885.62
  5. Step 5: Solve for x
    x = 394,885.62/612.95
  6. Step 6: Final answer
    x = 644.24

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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.