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Finding the Fourth Proportional to 993.21, 1,373.22 and 870.18

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Solution

The fourth proportional to 993.21, 1,373.22 and 870.18 is: 1,203.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.21 : 1,373.22 = 870.18 : x
  2. Step 2: Convert to fraction form
    993.21/1,373.22 = 870.18/x
  3. Step 3: Cross multiply
    993.21x = 1,373.22 × 870.18
  4. Step 4: Simplify right side
    993.21x = 1,194,948.58
  5. Step 5: Solve for x
    x = 1,194,948.58/993.21
  6. Step 6: Final answer
    x = 1,203.12

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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.