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Finding the Fourth Proportional to 873.65, 1,205.78 and 500.58

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Solution

The fourth proportional to 873.65, 1,205.78 and 500.58 is: 690.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.65 : 1,205.78 = 500.58 : x
  2. Step 2: Convert to fraction form
    873.65/1,205.78 = 500.58/x
  3. Step 3: Cross multiply
    873.65x = 1,205.78 × 500.58
  4. Step 4: Simplify right side
    873.65x = 603,586.85
  5. Step 5: Solve for x
    x = 603,586.85/873.65
  6. Step 6: Final answer
    x = 690.88

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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.