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Finding the Fourth Proportional to 30,603.90, 45,903.15 and 8,415.30

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Solution

The fourth proportional to 30,603.90, 45,903.15 and 8,415.30 is: 12,622.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,603.90 : 45,903.15 = 8,415.30 : x
  2. Step 2: Convert to fraction form
    30,603.90/45,903.15 = 8,415.30/x
  3. Step 3: Cross multiply
    30,603.90x = 45,903.15 × 8,415.30
  4. Step 4: Simplify right side
    30,603.90x = 386,288,778.20
  5. Step 5: Solve for x
    x = 386,288,778.20/30,603.90
  6. Step 6: Final answer
    x = 12,622.21

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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.