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Finding the Fourth Proportional to 18,305.65, 25,260.42 and 12,345.40

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Solution

The fourth proportional to 18,305.65, 25,260.42 and 12,345.40 is: 17,035.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,305.65 : 25,260.42 = 12,345.40 : x
  2. Step 2: Convert to fraction form
    18,305.65/25,260.42 = 12,345.40/x
  3. Step 3: Cross multiply
    18,305.65x = 25,260.42 × 12,345.40
  4. Step 4: Simplify right side
    18,305.65x = 311,849,989.07
  5. Step 5: Solve for x
    x = 311,849,989.07/18,305.65
  6. Step 6: Final answer
    x = 17,035.72

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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.