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Finding the Fourth Proportional to 993.72, 1,370.05 and 639.01

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Solution

The fourth proportional to 993.72, 1,370.05 and 639.01 is: 881.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.72 : 1,370.05 = 639.01 : x
  2. Step 2: Convert to fraction form
    993.72/1,370.05 = 639.01/x
  3. Step 3: Cross multiply
    993.72x = 1,370.05 × 639.01
  4. Step 4: Simplify right side
    993.72x = 875,475.77
  5. Step 5: Solve for x
    x = 875,475.77/993.72
  6. Step 6: Final answer
    x = 881.01

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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.