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Finding the Fourth Proportional to 85,681.70, 128,605.57 and 41,339.63

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Solution

The fourth proportional to 85,681.70, 128,605.57 and 41,339.63 is: 62,049.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,681.70 : 128,605.57 = 41,339.63 : x
  2. Step 2: Convert to fraction form
    85,681.70/128,605.57 = 41,339.63/x
  3. Step 3: Cross multiply
    85,681.70x = 128,605.57 × 41,339.63
  4. Step 4: Simplify right side
    85,681.70x = 5,316,506,679.74
  5. Step 5: Solve for x
    x = 5,316,506,679.74/85,681.70
  6. Step 6: Final answer
    x = 62,049.50

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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.