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Finding the Fourth Proportional to 70,149.10, 105,239.20 and 20,225.31

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Solution

The fourth proportional to 70,149.10, 105,239.20 and 20,225.31 is: 30,342.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,149.10 : 105,239.20 = 20,225.31 : x
  2. Step 2: Convert to fraction form
    70,149.10/105,239.20 = 20,225.31/x
  3. Step 3: Cross multiply
    70,149.10x = 105,239.20 × 20,225.31
  4. Step 4: Simplify right side
    70,149.10x = 2,128,495,184.86
  5. Step 5: Solve for x
    x = 2,128,495,184.86/70,149.10
  6. Step 6: Final answer
    x = 30,342.44

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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.