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Finding the Fourth Proportional to 985.13, 1,360.13 and 612.66

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Solution

The fourth proportional to 985.13, 1,360.13 and 612.66 is: 845.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.13 : 1,360.13 = 612.66 : x
  2. Step 2: Convert to fraction form
    985.13/1,360.13 = 612.66/x
  3. Step 3: Cross multiply
    985.13x = 1,360.13 × 612.66
  4. Step 4: Simplify right side
    985.13x = 833,297.25
  5. Step 5: Solve for x
    x = 833,297.25/985.13
  6. Step 6: Final answer
    x = 845.88

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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.