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Finding the Fourth Proportional to 82,666.60, 123,999.90 and 53,117.80

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Solution

The fourth proportional to 82,666.60, 123,999.90 and 53,117.80 is: 79,676.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,666.60 : 123,999.90 = 53,117.80 : x
  2. Step 2: Convert to fraction form
    82,666.60/123,999.90 = 53,117.80/x
  3. Step 3: Cross multiply
    82,666.60x = 123,999.90 × 53,117.80
  4. Step 4: Simplify right side
    82,666.60x = 6,586,601,888.22
  5. Step 5: Solve for x
    x = 6,586,601,888.22/82,666.60
  6. Step 6: Final answer
    x = 79,676.70

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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.