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Finding the Fourth Proportional to 985.76, 1,359.80 and 612.60

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Solution

The fourth proportional to 985.76, 1,359.80 and 612.60 is: 845.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.76 : 1,359.80 = 612.60 : x
  2. Step 2: Convert to fraction form
    985.76/1,359.80 = 612.60/x
  3. Step 3: Cross multiply
    985.76x = 1,359.80 × 612.60
  4. Step 4: Simplify right side
    985.76x = 833,013.48
  5. Step 5: Solve for x
    x = 833,013.48/985.76
  6. Step 6: Final answer
    x = 845.05

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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.