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Finding the Fourth Proportional to 100,629.99, 138,860.35 and 55,307.45

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Solution

The fourth proportional to 100,629.99, 138,860.35 and 55,307.45 is: 76,319.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,629.99 : 138,860.35 = 55,307.45 : x
  2. Step 2: Convert to fraction form
    100,629.99/138,860.35 = 55,307.45/x
  3. Step 3: Cross multiply
    100,629.99x = 138,860.35 × 55,307.45
  4. Step 4: Simplify right side
    100,629.99x = 7,680,012,073.49
  5. Step 5: Solve for x
    x = 7,680,012,073.49/100,629.99
  6. Step 6: Final answer
    x = 76,319.32

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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.