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Finding the Fourth Proportional to 899.71, 1,340.26 and 872.51

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Solution

The fourth proportional to 899.71, 1,340.26 and 872.51 is: 1,299.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.71 : 1,340.26 = 872.51 : x
  2. Step 2: Convert to fraction form
    899.71/1,340.26 = 872.51/x
  3. Step 3: Cross multiply
    899.71x = 1,340.26 × 872.51
  4. Step 4: Simplify right side
    899.71x = 1,169,386.28
  5. Step 5: Solve for x
    x = 1,169,386.28/899.71
  6. Step 6: Final answer
    x = 1,299.74

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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.