Home / 85,728.48-128,540.88-57,942.24

Finding the Fourth Proportional to 85,728.48, 128,540.88 and 57,942.24

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Solution

The fourth proportional to 85,728.48, 128,540.88 and 57,942.24 is: 86,878.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,728.48 : 128,540.88 = 57,942.24 : x
  2. Step 2: Convert to fraction form
    85,728.48/128,540.88 = 57,942.24/x
  3. Step 3: Cross multiply
    85,728.48x = 128,540.88 × 57,942.24
  4. Step 4: Simplify right side
    85,728.48x = 7,447,946,518.77
  5. Step 5: Solve for x
    x = 7,447,946,518.77/85,728.48
  6. Step 6: Final answer
    x = 86,878.32

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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.