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Finding the Fourth Proportional to 70,003.60, 105,005.40 and 66,212.80

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Solution

The fourth proportional to 70,003.60, 105,005.40 and 66,212.80 is: 99,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,003.60 : 105,005.40 = 66,212.80 : x
  2. Step 2: Convert to fraction form
    70,003.60/105,005.40 = 66,212.80/x
  3. Step 3: Cross multiply
    70,003.60x = 105,005.40 × 66,212.80
  4. Step 4: Simplify right side
    70,003.60x = 6,952,701,549.12
  5. Step 5: Solve for x
    x = 6,952,701,549.12/70,003.60
  6. Step 6: Final answer
    x = 99,319.20

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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.