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Finding the Fourth Proportional to 994.51, 1,371.16 and 621.35

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Solution

The fourth proportional to 994.51, 1,371.16 and 621.35 is: 856.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.51 : 1,371.16 = 621.35 : x
  2. Step 2: Convert to fraction form
    994.51/1,371.16 = 621.35/x
  3. Step 3: Cross multiply
    994.51x = 1,371.16 × 621.35
  4. Step 4: Simplify right side
    994.51x = 851,970.87
  5. Step 5: Solve for x
    x = 851,970.87/994.51
  6. Step 6: Final answer
    x = 856.67

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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.