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Finding the Fourth Proportional to 76,659.63, 105,777.12 and 70,458.71

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Solution

The fourth proportional to 76,659.63, 105,777.12 and 70,458.71 is: 97,220.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,659.63 : 105,777.12 = 70,458.71 : x
  2. Step 2: Convert to fraction form
    76,659.63/105,777.12 = 70,458.71/x
  3. Step 3: Cross multiply
    76,659.63x = 105,777.12 × 70,458.71
  4. Step 4: Simplify right side
    76,659.63x = 7,452,918,893.83
  5. Step 5: Solve for x
    x = 7,452,918,893.83/76,659.63
  6. Step 6: Final answer
    x = 97,220.91

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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.