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Finding the Fourth Proportional to 18,411.60, 25,410.06 and 12,455.40

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Solution

The fourth proportional to 18,411.60, 25,410.06 and 12,455.40 is: 17,189.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,411.60 : 25,410.06 = 12,455.40 : x
  2. Step 2: Convert to fraction form
    18,411.60/25,410.06 = 12,455.40/x
  3. Step 3: Cross multiply
    18,411.60x = 25,410.06 × 12,455.40
  4. Step 4: Simplify right side
    18,411.60x = 316,492,461.32
  5. Step 5: Solve for x
    x = 316,492,461.32/18,411.60
  6. Step 6: Final answer
    x = 17,189.84

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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.