Home / 1,109.18-1,663.75-287.45

Finding the Fourth Proportional to 1,109.18, 1,663.75 and 287.45

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Solution

The fourth proportional to 1,109.18, 1,663.75 and 287.45 is: 431.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.18 : 1,663.75 = 287.45 : x
  2. Step 2: Convert to fraction form
    1,109.18/1,663.75 = 287.45/x
  3. Step 3: Cross multiply
    1,109.18x = 1,663.75 × 287.45
  4. Step 4: Simplify right side
    1,109.18x = 478,243.50
  5. Step 5: Solve for x
    x = 478,243.50/1,109.18
  6. Step 6: Final answer
    x = 431.17

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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.