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Finding the Fourth Proportional to 30,612.51, 45,912.72 and 8,420.16

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Solution

The fourth proportional to 30,612.51, 45,912.72 and 8,420.16 is: 12,628.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,612.51 : 45,912.72 = 8,420.16 : x
  2. Step 2: Convert to fraction form
    30,612.51/45,912.72 = 8,420.16/x
  3. Step 3: Cross multiply
    30,612.51x = 45,912.72 × 8,420.16
  4. Step 4: Simplify right side
    30,612.51x = 386,592,448.44
  5. Step 5: Solve for x
    x = 386,592,448.44/30,612.51
  6. Step 6: Final answer
    x = 12,628.58

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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.