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Finding the Fourth Proportional to 1,638.66, 2,261.32 and 930.62

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Solution

The fourth proportional to 1,638.66, 2,261.32 and 930.62 is: 1,284.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.66 : 2,261.32 = 930.62 : x
  2. Step 2: Convert to fraction form
    1,638.66/2,261.32 = 930.62/x
  3. Step 3: Cross multiply
    1,638.66x = 2,261.32 × 930.62
  4. Step 4: Simplify right side
    1,638.66x = 2,104,432.95
  5. Step 5: Solve for x
    x = 2,104,432.95/1,638.66
  6. Step 6: Final answer
    x = 1,284.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.