Home / 85,828.80-128,743.20-78,225.60

Finding the Fourth Proportional to 85,828.80, 128,743.20 and 78,225.60

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Solution

The fourth proportional to 85,828.80, 128,743.20 and 78,225.60 is: 117,338.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,828.80 : 128,743.20 = 78,225.60 : x
  2. Step 2: Convert to fraction form
    85,828.80/128,743.20 = 78,225.60/x
  3. Step 3: Cross multiply
    85,828.80x = 128,743.20 × 78,225.60
  4. Step 4: Simplify right side
    85,828.80x = 10,071,014,065.92
  5. Step 5: Solve for x
    x = 10,071,014,065.92/85,828.80
  6. Step 6: Final answer
    x = 117,338.40

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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.