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Finding the Fourth Proportional to 85,963.88, 128,778.08 and 56,291.76

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Solution

The fourth proportional to 85,963.88, 128,778.08 and 56,291.76 is: 84,327.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,963.88 : 128,778.08 = 56,291.76 : x
  2. Step 2: Convert to fraction form
    85,963.88/128,778.08 = 56,291.76/x
  3. Step 3: Cross multiply
    85,963.88x = 128,778.08 × 56,291.76
  4. Step 4: Simplify right side
    85,963.88x = 7,249,144,242.02
  5. Step 5: Solve for x
    x = 7,249,144,242.02/85,963.88
  6. Step 6: Final answer
    x = 84,327.79

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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.