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Finding the Fourth Proportional to 100,405.58, 138,557.64 and 55,693.58

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Solution

The fourth proportional to 100,405.58, 138,557.64 and 55,693.58 is: 76,856.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,405.58 : 138,557.64 = 55,693.58 : x
  2. Step 2: Convert to fraction form
    100,405.58/138,557.64 = 55,693.58/x
  3. Step 3: Cross multiply
    100,405.58x = 138,557.64 × 55,693.58
  4. Step 4: Simplify right side
    100,405.58x = 7,716,771,007.95
  5. Step 5: Solve for x
    x = 7,716,771,007.95/100,405.58
  6. Step 6: Final answer
    x = 76,856.00

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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.