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Finding the Fourth Proportional to 2,021.43, 3,030.93 and 787.40

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Solution

The fourth proportional to 2,021.43, 3,030.93 and 787.40 is: 1,180.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,021.43 : 3,030.93 = 787.40 : x
  2. Step 2: Convert to fraction form
    2,021.43/3,030.93 = 787.40/x
  3. Step 3: Cross multiply
    2,021.43x = 3,030.93 × 787.40
  4. Step 4: Simplify right side
    2,021.43x = 2,386,539.75
  5. Step 5: Solve for x
    x = 2,386,539.75/2,021.43
  6. Step 6: Final answer
    x = 1,180.62

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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.