Home / 6,420.45-8,860.23-3,587.78

Finding the Fourth Proportional to 6,420.45, 8,860.23 and 3,587.78

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Solution

The fourth proportional to 6,420.45, 8,860.23 and 3,587.78 is: 4,951.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.45 : 8,860.23 = 3,587.78 : x
  2. Step 2: Convert to fraction form
    6,420.45/8,860.23 = 3,587.78/x
  3. Step 3: Cross multiply
    6,420.45x = 8,860.23 × 3,587.78
  4. Step 4: Simplify right side
    6,420.45x = 31,788,511.69
  5. Step 5: Solve for x
    x = 31,788,511.69/6,420.45
  6. Step 6: Final answer
    x = 4,951.13

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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.