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Finding the Fourth Proportional to 971.44, 1,340.88 and 661.12

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Solution

The fourth proportional to 971.44, 1,340.88 and 661.12 is: 912.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.44 : 1,340.88 = 661.12 : x
  2. Step 2: Convert to fraction form
    971.44/1,340.88 = 661.12/x
  3. Step 3: Cross multiply
    971.44x = 1,340.88 × 661.12
  4. Step 4: Simplify right side
    971.44x = 886,482.59
  5. Step 5: Solve for x
    x = 886,482.59/971.44
  6. Step 6: Final answer
    x = 912.54

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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.