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Finding the Fourth Proportional to 70,292.16, 105,443.64 and 20,372.94

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Solution

The fourth proportional to 70,292.16, 105,443.64 and 20,372.94 is: 30,560.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,292.16 : 105,443.64 = 20,372.94 : x
  2. Step 2: Convert to fraction form
    70,292.16/105,443.64 = 20,372.94/x
  3. Step 3: Cross multiply
    70,292.16x = 105,443.64 × 20,372.94
  4. Step 4: Simplify right side
    70,292.16x = 2,148,196,951.10
  5. Step 5: Solve for x
    x = 2,148,196,951.10/70,292.16
  6. Step 6: Final answer
    x = 30,560.98

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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.