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Finding the Fourth Proportional to 85,535.80, 128,303.70 and 69,983.80

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Solution

The fourth proportional to 85,535.80, 128,303.70 and 69,983.80 is: 104,975.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,535.80 : 128,303.70 = 69,983.80 : x
  2. Step 2: Convert to fraction form
    85,535.80/128,303.70 = 69,983.80/x
  3. Step 3: Cross multiply
    85,535.80x = 128,303.70 × 69,983.80
  4. Step 4: Simplify right side
    85,535.80x = 8,979,180,480.06
  5. Step 5: Solve for x
    x = 8,979,180,480.06/85,535.80
  6. Step 6: Final answer
    x = 104,975.70

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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.