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Finding the Fourth Proportional to 70,457.61, 105,720.55 and 31,009.60

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Solution

The fourth proportional to 70,457.61, 105,720.55 and 31,009.60 is: 46,529.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,457.61 : 105,720.55 = 31,009.60 : x
  2. Step 2: Convert to fraction form
    70,457.61/105,720.55 = 31,009.60/x
  3. Step 3: Cross multiply
    70,457.61x = 105,720.55 × 31,009.60
  4. Step 4: Simplify right side
    70,457.61x = 3,278,351,625.45
  5. Step 5: Solve for x
    x = 3,278,351,625.45/70,457.61
  6. Step 6: Final answer
    x = 46,529.42

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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.