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Finding the Fourth Proportional to 86,705.93, 129,874.79 and 56,613.89

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Solution

The fourth proportional to 86,705.93, 129,874.79 and 56,613.89 is: 84,800.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,705.93 : 129,874.79 = 56,613.89 : x
  2. Step 2: Convert to fraction form
    86,705.93/129,874.79 = 56,613.89/x
  3. Step 3: Cross multiply
    86,705.93x = 129,874.79 × 56,613.89
  4. Step 4: Simplify right side
    86,705.93x = 7,352,717,541.05
  5. Step 5: Solve for x
    x = 7,352,717,541.05/86,705.93
  6. Step 6: Final answer
    x = 84,800.63

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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.