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Finding the Fourth Proportional to 2,085.63, 3,127.23 and 787.20

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Solution

The fourth proportional to 2,085.63, 3,127.23 and 787.20 is: 1,180.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.63 : 3,127.23 = 787.20 : x
  2. Step 2: Convert to fraction form
    2,085.63/3,127.23 = 787.20/x
  3. Step 3: Cross multiply
    2,085.63x = 3,127.23 × 787.20
  4. Step 4: Simplify right side
    2,085.63x = 2,461,755.46
  5. Step 5: Solve for x
    x = 2,461,755.46/2,085.63
  6. Step 6: Final answer
    x = 1,180.34

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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.