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Finding the Fourth Proportional to 918.21, 1,267.47 and 624.99

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Solution

The fourth proportional to 918.21, 1,267.47 and 624.99 is: 862.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.21 : 1,267.47 = 624.99 : x
  2. Step 2: Convert to fraction form
    918.21/1,267.47 = 624.99/x
  3. Step 3: Cross multiply
    918.21x = 1,267.47 × 624.99
  4. Step 4: Simplify right side
    918.21x = 792,156.08
  5. Step 5: Solve for x
    x = 792,156.08/918.21
  6. Step 6: Final answer
    x = 862.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.