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Finding the Fourth Proportional to 18,640.61, 25,718.94 and 12,968.99

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Solution

The fourth proportional to 18,640.61, 25,718.94 and 12,968.99 is: 17,893.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.61 : 25,718.94 = 12,968.99 : x
  2. Step 2: Convert to fraction form
    18,640.61/25,718.94 = 12,968.99/x
  3. Step 3: Cross multiply
    18,640.61x = 25,718.94 × 12,968.99
  4. Step 4: Simplify right side
    18,640.61x = 333,548,547.08
  5. Step 5: Solve for x
    x = 333,548,547.08/18,640.61
  6. Step 6: Final answer
    x = 17,893.65

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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.