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Finding the Fourth Proportional to 72,943.22, 100,661.54 and 39,409.22

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Solution

The fourth proportional to 72,943.22, 100,661.54 and 39,409.22 is: 54,384.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,943.22 : 100,661.54 = 39,409.22 : x
  2. Step 2: Convert to fraction form
    72,943.22/100,661.54 = 39,409.22/x
  3. Step 3: Cross multiply
    72,943.22x = 100,661.54 × 39,409.22
  4. Step 4: Simplify right side
    72,943.22x = 3,966,992,075.05
  5. Step 5: Solve for x
    x = 3,966,992,075.05/72,943.22
  6. Step 6: Final answer
    x = 54,384.66

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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.