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Finding the Fourth Proportional to 70,002.60, 105,003.90 and 38,400.45

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Solution

The fourth proportional to 70,002.60, 105,003.90 and 38,400.45 is: 57,600.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,002.60 : 105,003.90 = 38,400.45 : x
  2. Step 2: Convert to fraction form
    70,002.60/105,003.90 = 38,400.45/x
  3. Step 3: Cross multiply
    70,002.60x = 105,003.90 × 38,400.45
  4. Step 4: Simplify right side
    70,002.60x = 4,032,197,011.76
  5. Step 5: Solve for x
    x = 4,032,197,011.76/70,002.60
  6. Step 6: Final answer
    x = 57,600.68

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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.