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Finding the Fourth Proportional to 70,088, 105,132 and 20,840

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Solution

The fourth proportional to 70,088, 105,132 and 20,840 is: 31,260

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,088 : 105,132 = 20,840 : x
  2. Step 2: Convert to fraction form
    70,088/105,132 = 20,840/x
  3. Step 3: Cross multiply
    70,088x = 105,132 × 20,840
  4. Step 4: Simplify right side
    70,088x = 2,190,950,880
  5. Step 5: Solve for x
    x = 2,190,950,880/70,088
  6. Step 6: Final answer
    x = 31,260

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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.