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Finding the Fourth Proportional to 872.04, 1,298.91 and 870.36

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Solution

The fourth proportional to 872.04, 1,298.91 and 870.36 is: 1,296.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.04 : 1,298.91 = 870.36 : x
  2. Step 2: Convert to fraction form
    872.04/1,298.91 = 870.36/x
  3. Step 3: Cross multiply
    872.04x = 1,298.91 × 870.36
  4. Step 4: Simplify right side
    872.04x = 1,130,519.31
  5. Step 5: Solve for x
    x = 1,130,519.31/872.04
  6. Step 6: Final answer
    x = 1,296.41

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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.