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Finding the Fourth Proportional to 985.50, 1,360.26 and 671.22

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Solution

The fourth proportional to 985.50, 1,360.26 and 671.22 is: 926.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.50 : 1,360.26 = 671.22 : x
  2. Step 2: Convert to fraction form
    985.50/1,360.26 = 671.22/x
  3. Step 3: Cross multiply
    985.50x = 1,360.26 × 671.22
  4. Step 4: Simplify right side
    985.50x = 913,033.72
  5. Step 5: Solve for x
    x = 913,033.72/985.50
  6. Step 6: Final answer
    x = 926.47

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1.5x scale

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.