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Finding the Fourth Proportional to 1,813.55, 2,718.50 and 990.12

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Solution

The fourth proportional to 1,813.55, 2,718.50 and 990.12 is: 1,484.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.55 : 2,718.50 = 990.12 : x
  2. Step 2: Convert to fraction form
    1,813.55/2,718.50 = 990.12/x
  3. Step 3: Cross multiply
    1,813.55x = 2,718.50 × 990.12
  4. Step 4: Simplify right side
    1,813.55x = 2,691,641.22
  5. Step 5: Solve for x
    x = 2,691,641.22/1,813.55
  6. Step 6: Final answer
    x = 1,484.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.