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Finding the Fourth Proportional to 30,010.40, 45,015.60 and 12,492.80

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Solution

The fourth proportional to 30,010.40, 45,015.60 and 12,492.80 is: 18,739.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,010.40 : 45,015.60 = 12,492.80 : x
  2. Step 2: Convert to fraction form
    30,010.40/45,015.60 = 12,492.80/x
  3. Step 3: Cross multiply
    30,010.40x = 45,015.60 × 12,492.80
  4. Step 4: Simplify right side
    30,010.40x = 562,370,887.68
  5. Step 5: Solve for x
    x = 562,370,887.68/30,010.40
  6. Step 6: Final answer
    x = 18,739.20

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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.