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Finding the Fourth Proportional to 85,678.29, 128,513.79 and 23,348.79

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Solution

The fourth proportional to 85,678.29, 128,513.79 and 23,348.79 is: 35,022.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.29 : 128,513.79 = 23,348.79 : x
  2. Step 2: Convert to fraction form
    85,678.29/128,513.79 = 23,348.79/x
  3. Step 3: Cross multiply
    85,678.29x = 128,513.79 × 23,348.79
  4. Step 4: Simplify right side
    85,678.29x = 3,000,641,494.81
  5. Step 5: Solve for x
    x = 3,000,641,494.81/85,678.29
  6. Step 6: Final answer
    x = 35,022.19

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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.