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Finding the Fourth Proportional to 1,790.40, 2,686.40 and 816.32

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Solution

The fourth proportional to 1,790.40, 2,686.40 and 816.32 is: 1,224.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,790.40 : 2,686.40 = 816.32 : x
  2. Step 2: Convert to fraction form
    1,790.40/2,686.40 = 816.32/x
  3. Step 3: Cross multiply
    1,790.40x = 2,686.40 × 816.32
  4. Step 4: Simplify right side
    1,790.40x = 2,192,962.05
  5. Step 5: Solve for x
    x = 2,192,962.05/1,790.40
  6. Step 6: Final answer
    x = 1,224.84

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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.