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Finding the Fourth Proportional to 128,547.34, 192,863.97 and 61,979.60

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Solution

The fourth proportional to 128,547.34, 192,863.97 and 61,979.60 is: 92,990.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,547.34 : 192,863.97 = 61,979.60 : x
  2. Step 2: Convert to fraction form
    128,547.34/192,863.97 = 61,979.60/x
  3. Step 3: Cross multiply
    128,547.34x = 192,863.97 × 61,979.60
  4. Step 4: Simplify right side
    128,547.34x = 11,953,632,197.17
  5. Step 5: Solve for x
    x = 11,953,632,197.17/128,547.34
  6. Step 6: Final answer
    x = 92,990.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.