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Finding the Fourth Proportional to 985.20, 1,360.13 and 654.19

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Solution

The fourth proportional to 985.20, 1,360.13 and 654.19 is: 903.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.20 : 1,360.13 = 654.19 : x
  2. Step 2: Convert to fraction form
    985.20/1,360.13 = 654.19/x
  3. Step 3: Cross multiply
    985.20x = 1,360.13 × 654.19
  4. Step 4: Simplify right side
    985.20x = 889,783.44
  5. Step 5: Solve for x
    x = 889,783.44/985.20
  6. Step 6: Final answer
    x = 903.15

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Double scale
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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.