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Finding the Fourth Proportional to 985.60, 1,476.60 and 830.80

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Solution

The fourth proportional to 985.60, 1,476.60 and 830.80 is: 1,244.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.60 : 1,476.60 = 830.80 : x
  2. Step 2: Convert to fraction form
    985.60/1,476.60 = 830.80/x
  3. Step 3: Cross multiply
    985.60x = 1,476.60 × 830.80
  4. Step 4: Simplify right side
    985.60x = 1,226,759.28
  5. Step 5: Solve for x
    x = 1,226,759.28/985.60
  6. Step 6: Final answer
    x = 1,244.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.