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Finding the Fourth Proportional to 985.80, 1,469.76 and 960.15

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Solution

The fourth proportional to 985.80, 1,469.76 and 960.15 is: 1,431.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.80 : 1,469.76 = 960.15 : x
  2. Step 2: Convert to fraction form
    985.80/1,469.76 = 960.15/x
  3. Step 3: Cross multiply
    985.80x = 1,469.76 × 960.15
  4. Step 4: Simplify right side
    985.80x = 1,411,190.06
  5. Step 5: Solve for x
    x = 1,411,190.06/985.80
  6. Step 6: Final answer
    x = 1,431.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.