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Finding the Fourth Proportional to 898.21, 1,339.61 and 879.94

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Solution

The fourth proportional to 898.21, 1,339.61 and 879.94 is: 1,312.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.21 : 1,339.61 = 879.94 : x
  2. Step 2: Convert to fraction form
    898.21/1,339.61 = 879.94/x
  3. Step 3: Cross multiply
    898.21x = 1,339.61 × 879.94
  4. Step 4: Simplify right side
    898.21x = 1,178,776.42
  5. Step 5: Solve for x
    x = 1,178,776.42/898.21
  6. Step 6: Final answer
    x = 1,312.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.