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Finding the Fourth Proportional to 100,397.49, 138,549.60 and 55,075.56

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Solution

The fourth proportional to 100,397.49, 138,549.60 and 55,075.56 is: 76,004.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,397.49 : 138,549.60 = 55,075.56 : x
  2. Step 2: Convert to fraction form
    100,397.49/138,549.60 = 55,075.56/x
  3. Step 3: Cross multiply
    100,397.49x = 138,549.60 × 55,075.56
  4. Step 4: Simplify right side
    100,397.49x = 7,630,696,807.78
  5. Step 5: Solve for x
    x = 7,630,696,807.78/100,397.49
  6. Step 6: Final answer
    x = 76,004.86

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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.