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Finding the Fourth Proportional to 128,420.70, 192,631.65 and 45,314.70

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Solution

The fourth proportional to 128,420.70, 192,631.65 and 45,314.70 is: 67,972.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.70 : 192,631.65 = 45,314.70 : x
  2. Step 2: Convert to fraction form
    128,420.70/192,631.65 = 45,314.70/x
  3. Step 3: Cross multiply
    128,420.70x = 192,631.65 × 45,314.70
  4. Step 4: Simplify right side
    128,420.70x = 8,729,045,430.26
  5. Step 5: Solve for x
    x = 8,729,045,430.26/128,420.70
  6. Step 6: Final answer
    x = 67,972.26

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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.