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Finding the Fourth Proportional to 18,405.68, 25,400.40 and 10,447.16

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Solution

The fourth proportional to 18,405.68, 25,400.40 and 10,447.16 is: 14,417.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,405.68 : 25,400.40 = 10,447.16 : x
  2. Step 2: Convert to fraction form
    18,405.68/25,400.40 = 10,447.16/x
  3. Step 3: Cross multiply
    18,405.68x = 25,400.40 × 10,447.16
  4. Step 4: Simplify right side
    18,405.68x = 265,362,042.86
  5. Step 5: Solve for x
    x = 265,362,042.86/18,405.68
  6. Step 6: Final answer
    x = 14,417.40

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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.