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Finding the Fourth Proportional to 1,310.90, 1,809.24 and 787.22

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Solution

The fourth proportional to 1,310.90, 1,809.24 and 787.22 is: 1,086.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.90 : 1,809.24 = 787.22 : x
  2. Step 2: Convert to fraction form
    1,310.90/1,809.24 = 787.22/x
  3. Step 3: Cross multiply
    1,310.90x = 1,809.24 × 787.22
  4. Step 4: Simplify right side
    1,310.90x = 1,424,269.91
  5. Step 5: Solve for x
    x = 1,424,269.91/1,310.90
  6. Step 6: Final answer
    x = 1,086.48

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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.