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Finding the Fourth Proportional to 70,472.38, 105,692.40 and 42,017.39

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Solution

The fourth proportional to 70,472.38, 105,692.40 and 42,017.39 is: 63,016.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,472.38 : 105,692.40 = 42,017.39 : x
  2. Step 2: Convert to fraction form
    70,472.38/105,692.40 = 42,017.39/x
  3. Step 3: Cross multiply
    70,472.38x = 105,692.40 × 42,017.39
  4. Step 4: Simplify right side
    70,472.38x = 4,440,918,289.45
  5. Step 5: Solve for x
    x = 4,440,918,289.45/70,472.38
  6. Step 6: Final answer
    x = 63,016.43

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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.