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Finding the Fourth Proportional to 993.94, 1,371.63 and 870.01

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Solution

The fourth proportional to 993.94, 1,371.63 and 870.01 is: 1,200.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.94 : 1,371.63 = 870.01 : x
  2. Step 2: Convert to fraction form
    993.94/1,371.63 = 870.01/x
  3. Step 3: Cross multiply
    993.94x = 1,371.63 × 870.01
  4. Step 4: Simplify right side
    993.94x = 1,193,331.65
  5. Step 5: Solve for x
    x = 1,193,331.65/993.94
  6. Step 6: Final answer
    x = 1,200.61

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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.