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Finding the Fourth Proportional to 985.19, 1,360.26 and 654.31

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Solution

The fourth proportional to 985.19, 1,360.26 and 654.31 is: 903.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.19 : 1,360.26 = 654.31 : x
  2. Step 2: Convert to fraction form
    985.19/1,360.26 = 654.31/x
  3. Step 3: Cross multiply
    985.19x = 1,360.26 × 654.31
  4. Step 4: Simplify right side
    985.19x = 890,028.32
  5. Step 5: Solve for x
    x = 890,028.32/985.19
  6. Step 6: Final answer
    x = 903.41

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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.