Home / 1,638.12-2,260.51-929.78

Finding the Fourth Proportional to 1,638.12, 2,260.51 and 929.78

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Solution

The fourth proportional to 1,638.12, 2,260.51 and 929.78 is: 1,283.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.12 : 2,260.51 = 929.78 : x
  2. Step 2: Convert to fraction form
    1,638.12/2,260.51 = 929.78/x
  3. Step 3: Cross multiply
    1,638.12x = 2,260.51 × 929.78
  4. Step 4: Simplify right side
    1,638.12x = 2,101,771.84
  5. Step 5: Solve for x
    x = 2,101,771.84/1,638.12
  6. Step 6: Final answer
    x = 1,283.04

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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.