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Finding the Fourth Proportional to 115,359.70, 173,039.55 and 85,835.20

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Solution

The fourth proportional to 115,359.70, 173,039.55 and 85,835.20 is: 128,752.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,359.70 : 173,039.55 = 85,835.20 : x
  2. Step 2: Convert to fraction form
    115,359.70/173,039.55 = 85,835.20/x
  3. Step 3: Cross multiply
    115,359.70x = 173,039.55 × 85,835.20
  4. Step 4: Simplify right side
    115,359.70x = 14,852,884,382.16
  5. Step 5: Solve for x
    x = 14,852,884,382.16/115,359.70
  6. Step 6: Final answer
    x = 128,752.80

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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.