Home / 85,964.20-128,946.30-71,189.80

Finding the Fourth Proportional to 85,964.20, 128,946.30 and 71,189.80

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Solution

The fourth proportional to 85,964.20, 128,946.30 and 71,189.80 is: 106,784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,964.20 : 128,946.30 = 71,189.80 : x
  2. Step 2: Convert to fraction form
    85,964.20/128,946.30 = 71,189.80/x
  3. Step 3: Cross multiply
    85,964.20x = 128,946.30 × 71,189.80
  4. Step 4: Simplify right side
    85,964.20x = 9,179,661,307.74
  5. Step 5: Solve for x
    x = 9,179,661,307.74/85,964.20
  6. Step 6: Final answer
    x = 106,784.70

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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.