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Finding the Fourth Proportional to 85,673.60, 128,510.40 and 78,286.40

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Solution

The fourth proportional to 85,673.60, 128,510.40 and 78,286.40 is: 117,429.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,673.60 : 128,510.40 = 78,286.40 : x
  2. Step 2: Convert to fraction form
    85,673.60/128,510.40 = 78,286.40/x
  3. Step 3: Cross multiply
    85,673.60x = 128,510.40 × 78,286.40
  4. Step 4: Simplify right side
    85,673.60x = 10,060,616,578.56
  5. Step 5: Solve for x
    x = 10,060,616,578.56/85,673.60
  6. Step 6: Final answer
    x = 117,429.60

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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.