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Finding the Fourth Proportional to 985.77, 1,480.28 and 661.77

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Solution

The fourth proportional to 985.77, 1,480.28 and 661.77 is: 993.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.77 : 1,480.28 = 661.77 : x
  2. Step 2: Convert to fraction form
    985.77/1,480.28 = 661.77/x
  3. Step 3: Cross multiply
    985.77x = 1,480.28 × 661.77
  4. Step 4: Simplify right side
    985.77x = 979,601.59
  5. Step 5: Solve for x
    x = 979,601.59/985.77
  6. Step 6: Final answer
    x = 993.74

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1.5x scale

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.