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Finding the Fourth Proportional to 873.61, 1,205.60 and 500.65

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Solution

The fourth proportional to 873.61, 1,205.60 and 500.65 is: 690.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.61 : 1,205.60 = 500.65 : x
  2. Step 2: Convert to fraction form
    873.61/1,205.60 = 500.65/x
  3. Step 3: Cross multiply
    873.61x = 1,205.60 × 500.65
  4. Step 4: Simplify right side
    873.61x = 603,583.64
  5. Step 5: Solve for x
    x = 603,583.64/873.61
  6. Step 6: Final answer
    x = 690.91

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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.