Home / 5,239.81-7,228.15-3,978.77

Finding the Fourth Proportional to 5,239.81, 7,228.15 and 3,978.77

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Solution

The fourth proportional to 5,239.81, 7,228.15 and 3,978.77 is: 5,488.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,239.81 : 7,228.15 = 3,978.77 : x
  2. Step 2: Convert to fraction form
    5,239.81/7,228.15 = 3,978.77/x
  3. Step 3: Cross multiply
    5,239.81x = 7,228.15 × 3,978.77
  4. Step 4: Simplify right side
    5,239.81x = 28,759,154.50
  5. Step 5: Solve for x
    x = 28,759,154.50/5,239.81
  6. Step 6: Final answer
    x = 5,488.59

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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.