Home / 1,621.15-2,430.23-787.72

Finding the Fourth Proportional to 1,621.15, 2,430.23 and 787.72

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Solution

The fourth proportional to 1,621.15, 2,430.23 and 787.72 is: 1,180.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.15 : 2,430.23 = 787.72 : x
  2. Step 2: Convert to fraction form
    1,621.15/2,430.23 = 787.72/x
  3. Step 3: Cross multiply
    1,621.15x = 2,430.23 × 787.72
  4. Step 4: Simplify right side
    1,621.15x = 1,914,340.78
  5. Step 5: Solve for x
    x = 1,914,340.78/1,621.15
  6. Step 6: Final answer
    x = 1,180.85

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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.