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Finding the Fourth Proportional to 873.69, 1,205.55 and 500.61

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Solution

The fourth proportional to 873.69, 1,205.55 and 500.61 is: 690.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.69 : 1,205.55 = 500.61 : x
  2. Step 2: Convert to fraction form
    873.69/1,205.55 = 500.61/x
  3. Step 3: Cross multiply
    873.69x = 1,205.55 × 500.61
  4. Step 4: Simplify right side
    873.69x = 603,514.91
  5. Step 5: Solve for x
    x = 603,514.91/873.69
  6. Step 6: Final answer
    x = 690.77

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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.