Home / 1,113.30-1,665.09-909.18

Finding the Fourth Proportional to 1,113.30, 1,665.09 and 909.18

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Solution

The fourth proportional to 1,113.30, 1,665.09 and 909.18 is: 1,359.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.30 : 1,665.09 = 909.18 : x
  2. Step 2: Convert to fraction form
    1,113.30/1,665.09 = 909.18/x
  3. Step 3: Cross multiply
    1,113.30x = 1,665.09 × 909.18
  4. Step 4: Simplify right side
    1,113.30x = 1,513,866.53
  5. Step 5: Solve for x
    x = 1,513,866.53/1,113.30
  6. Step 6: Final answer
    x = 1,359.80

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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.