Home / 7,139.07-9,855.27-4,782.78

Finding the Fourth Proportional to 7,139.07, 9,855.27 and 4,782.78

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Solution

The fourth proportional to 7,139.07, 9,855.27 and 4,782.78 is: 6,602.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.07 : 9,855.27 = 4,782.78 : x
  2. Step 2: Convert to fraction form
    7,139.07/9,855.27 = 4,782.78/x
  3. Step 3: Cross multiply
    7,139.07x = 9,855.27 × 4,782.78
  4. Step 4: Simplify right side
    7,139.07x = 47,135,588.25
  5. Step 5: Solve for x
    x = 47,135,588.25/7,139.07
  6. Step 6: Final answer
    x = 6,602.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.