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Finding the Fourth Proportional to 6,430.80, 8,875.53 and 3,778.86

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Solution

The fourth proportional to 6,430.80, 8,875.53 and 3,778.86 is: 5,215.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,430.80 : 8,875.53 = 3,778.86 : x
  2. Step 2: Convert to fraction form
    6,430.80/8,875.53 = 3,778.86/x
  3. Step 3: Cross multiply
    6,430.80x = 8,875.53 × 3,778.86
  4. Step 4: Simplify right side
    6,430.80x = 33,539,385.30
  5. Step 5: Solve for x
    x = 33,539,385.30/6,430.80
  6. Step 6: Final answer
    x = 5,215.43

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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.