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Finding the Fourth Proportional to 60,716.80, 91,075.20 and 39,721.60

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Solution

The fourth proportional to 60,716.80, 91,075.20 and 39,721.60 is: 59,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,716.80 : 91,075.20 = 39,721.60 : x
  2. Step 2: Convert to fraction form
    60,716.80/91,075.20 = 39,721.60/x
  3. Step 3: Cross multiply
    60,716.80x = 91,075.20 × 39,721.60
  4. Step 4: Simplify right side
    60,716.80x = 3,617,652,664.32
  5. Step 5: Solve for x
    x = 3,617,652,664.32/60,716.80
  6. Step 6: Final answer
    x = 59,582.40

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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.