Home / 1,307.09-1,964.46-1,089.11

Finding the Fourth Proportional to 1,307.09, 1,964.46 and 1,089.11

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Solution

The fourth proportional to 1,307.09, 1,964.46 and 1,089.11 is: 1,636.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.09 : 1,964.46 = 1,089.11 : x
  2. Step 2: Convert to fraction form
    1,307.09/1,964.46 = 1,089.11/x
  3. Step 3: Cross multiply
    1,307.09x = 1,964.46 × 1,089.11
  4. Step 4: Simplify right side
    1,307.09x = 2,139,513.03
  5. Step 5: Solve for x
    x = 2,139,513.03/1,307.09
  6. Step 6: Final answer
    x = 1,636.85

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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.