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Finding the Fourth Proportional to 70,416.80, 105,615.60 and 21,168.80

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Solution

The fourth proportional to 70,416.80, 105,615.60 and 21,168.80 is: 31,750.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,416.80 : 105,615.60 = 21,168.80 : x
  2. Step 2: Convert to fraction form
    70,416.80/105,615.60 = 21,168.80/x
  3. Step 3: Cross multiply
    70,416.80x = 105,615.60 × 21,168.80
  4. Step 4: Simplify right side
    70,416.80x = 2,235,755,513.28
  5. Step 5: Solve for x
    x = 2,235,755,513.28/70,416.80
  6. Step 6: Final answer
    x = 31,750.31

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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.