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Finding the Fourth Proportional to 985.04, 1,356.60 and 879.68

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Solution

The fourth proportional to 985.04, 1,356.60 and 879.68 is: 1,211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.04 : 1,356.60 = 879.68 : x
  2. Step 2: Convert to fraction form
    985.04/1,356.60 = 879.68/x
  3. Step 3: Cross multiply
    985.04x = 1,356.60 × 879.68
  4. Step 4: Simplify right side
    985.04x = 1,193,373.89
  5. Step 5: Solve for x
    x = 1,193,373.89/985.04
  6. Step 6: Final answer
    x = 1,211.50

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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.