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Finding the Fourth Proportional to 1,409.69, 2,114.81 and 435.75

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Solution

The fourth proportional to 1,409.69, 2,114.81 and 435.75 is: 653.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.69 : 2,114.81 = 435.75 : x
  2. Step 2: Convert to fraction form
    1,409.69/2,114.81 = 435.75/x
  3. Step 3: Cross multiply
    1,409.69x = 2,114.81 × 435.75
  4. Step 4: Simplify right side
    1,409.69x = 921,526.28
  5. Step 5: Solve for x
    x = 921,526.28/1,409.69
  6. Step 6: Final answer
    x = 653.71

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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.