Home / 1,087.80-1,635.30-929.40

Finding the Fourth Proportional to 1,087.80, 1,635.30 and 929.40

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Solution

The fourth proportional to 1,087.80, 1,635.30 and 929.40 is: 1,397.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.80 : 1,635.30 = 929.40 : x
  2. Step 2: Convert to fraction form
    1,087.80/1,635.30 = 929.40/x
  3. Step 3: Cross multiply
    1,087.80x = 1,635.30 × 929.40
  4. Step 4: Simplify right side
    1,087.80x = 1,519,847.82
  5. Step 5: Solve for x
    x = 1,519,847.82/1,087.80
  6. Step 6: Final answer
    x = 1,397.18

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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.