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Finding the Fourth Proportional to 81,138.60, 111,970.67 and 45,328.59

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Solution

The fourth proportional to 81,138.60, 111,970.67 and 45,328.59 is: 62,553.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,138.60 : 111,970.67 = 45,328.59 : x
  2. Step 2: Convert to fraction form
    81,138.60/111,970.67 = 45,328.59/x
  3. Step 3: Cross multiply
    81,138.60x = 111,970.67 × 45,328.59
  4. Step 4: Simplify right side
    81,138.60x = 5,075,472,365.81
  5. Step 5: Solve for x
    x = 5,075,472,365.81/81,138.60
  6. Step 6: Final answer
    x = 62,553.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.