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Finding the Fourth Proportional to 1,409.21, 2,113.97 and 435.39

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Solution

The fourth proportional to 1,409.21, 2,113.97 and 435.39 is: 653.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.21 : 2,113.97 = 435.39 : x
  2. Step 2: Convert to fraction form
    1,409.21/2,113.97 = 435.39/x
  3. Step 3: Cross multiply
    1,409.21x = 2,113.97 × 435.39
  4. Step 4: Simplify right side
    1,409.21x = 920,401.40
  5. Step 5: Solve for x
    x = 920,401.40/1,409.21
  6. Step 6: Final answer
    x = 653.13

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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.