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Finding the Fourth Proportional to 85,903.58, 128,614.95 and 64,777.50

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Solution

The fourth proportional to 85,903.58, 128,614.95 and 64,777.50 is: 96,984.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,903.58 : 128,614.95 = 64,777.50 : x
  2. Step 2: Convert to fraction form
    85,903.58/128,614.95 = 64,777.50/x
  3. Step 3: Cross multiply
    85,903.58x = 128,614.95 × 64,777.50
  4. Step 4: Simplify right side
    85,903.58x = 8,331,354,599.74
  5. Step 5: Solve for x
    x = 8,331,354,599.74/85,903.58
  6. Step 6: Final answer
    x = 96,984.96

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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.