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Finding the Fourth Proportional to 1,091.64, 1,637.70 and 388.74

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Solution

The fourth proportional to 1,091.64, 1,637.70 and 388.74 is: 583.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.64 : 1,637.70 = 388.74 : x
  2. Step 2: Convert to fraction form
    1,091.64/1,637.70 = 388.74/x
  3. Step 3: Cross multiply
    1,091.64x = 1,637.70 × 388.74
  4. Step 4: Simplify right side
    1,091.64x = 636,639.50
  5. Step 5: Solve for x
    x = 636,639.50/1,091.64
  6. Step 6: Final answer
    x = 583.20

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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.