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Finding the Fourth Proportional to 1,317.54, 1,818.18 and 720.04

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Solution

The fourth proportional to 1,317.54, 1,818.18 and 720.04 is: 993.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.54 : 1,818.18 = 720.04 : x
  2. Step 2: Convert to fraction form
    1,317.54/1,818.18 = 720.04/x
  3. Step 3: Cross multiply
    1,317.54x = 1,818.18 × 720.04
  4. Step 4: Simplify right side
    1,317.54x = 1,309,162.33
  5. Step 5: Solve for x
    x = 1,309,162.33/1,317.54
  6. Step 6: Final answer
    x = 993.64

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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.