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Finding the Fourth Proportional to 77,235.71, 115,850.11 and 21,075.64

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Solution

The fourth proportional to 77,235.71, 115,850.11 and 21,075.64 is: 31,612.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,235.71 : 115,850.11 = 21,075.64 : x
  2. Step 2: Convert to fraction form
    77,235.71/115,850.11 = 21,075.64/x
  3. Step 3: Cross multiply
    77,235.71x = 115,850.11 × 21,075.64
  4. Step 4: Simplify right side
    77,235.71x = 2,441,615,212.32
  5. Step 5: Solve for x
    x = 2,441,615,212.32/77,235.71
  6. Step 6: Final answer
    x = 31,612.52

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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.