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Finding the Fourth Proportional to 1,409.40, 2,114.23 and 435.78

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Solution

The fourth proportional to 1,409.40, 2,114.23 and 435.78 is: 653.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.40 : 2,114.23 = 435.78 : x
  2. Step 2: Convert to fraction form
    1,409.40/2,114.23 = 435.78/x
  3. Step 3: Cross multiply
    1,409.40x = 2,114.23 × 435.78
  4. Step 4: Simplify right side
    1,409.40x = 921,339.15
  5. Step 5: Solve for x
    x = 921,339.15/1,409.40
  6. Step 6: Final answer
    x = 653.71

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1.5x scale

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.