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Finding the Fourth Proportional to 1,310.68, 1,809.32 and 891.03

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Solution

The fourth proportional to 1,310.68, 1,809.32 and 891.03 is: 1,230.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.68 : 1,809.32 = 891.03 : x
  2. Step 2: Convert to fraction form
    1,310.68/1,809.32 = 891.03/x
  3. Step 3: Cross multiply
    1,310.68x = 1,809.32 × 891.03
  4. Step 4: Simplify right side
    1,310.68x = 1,612,158.40
  5. Step 5: Solve for x
    x = 1,612,158.40/1,310.68
  6. Step 6: Final answer
    x = 1,230.02

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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.