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Finding the Fourth Proportional to 100,570.75, 138,810.51 and 66,580.52

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Solution

The fourth proportional to 100,570.75, 138,810.51 and 66,580.52 is: 91,896.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,570.75 : 138,810.51 = 66,580.52 : x
  2. Step 2: Convert to fraction form
    100,570.75/138,810.51 = 66,580.52/x
  3. Step 3: Cross multiply
    100,570.75x = 138,810.51 × 66,580.52
  4. Step 4: Simplify right side
    100,570.75x = 9,242,075,243.21
  5. Step 5: Solve for x
    x = 9,242,075,243.21/100,570.75
  6. Step 6: Final answer
    x = 91,896.26

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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.