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Finding the Fourth Proportional to 985.91, 1,360.43 and 626.87

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Solution

The fourth proportional to 985.91, 1,360.43 and 626.87 is: 865.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.91 : 1,360.43 = 626.87 : x
  2. Step 2: Convert to fraction form
    985.91/1,360.43 = 626.87/x
  3. Step 3: Cross multiply
    985.91x = 1,360.43 × 626.87
  4. Step 4: Simplify right side
    985.91x = 852,815.37
  5. Step 5: Solve for x
    x = 852,815.37/985.91
  6. Step 6: Final answer
    x = 865.01

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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.