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Finding the Fourth Proportional to 18,390.63, 25,378.07 and 10,435.42

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Solution

The fourth proportional to 18,390.63, 25,378.07 and 10,435.42 is: 14,400.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.63 : 25,378.07 = 10,435.42 : x
  2. Step 2: Convert to fraction form
    18,390.63/25,378.07 = 10,435.42/x
  3. Step 3: Cross multiply
    18,390.63x = 25,378.07 × 10,435.42
  4. Step 4: Simplify right side
    18,390.63x = 264,830,819.24
  5. Step 5: Solve for x
    x = 264,830,819.24/18,390.63
  6. Step 6: Final answer
    x = 14,400.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.