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Finding the Fourth Proportional to 100,330.64, 138,457.84 and 55,012.76

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Solution

The fourth proportional to 100,330.64, 138,457.84 and 55,012.76 is: 75,918.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,330.64 : 138,457.84 = 55,012.76 : x
  2. Step 2: Convert to fraction form
    100,330.64/138,457.84 = 55,012.76/x
  3. Step 3: Cross multiply
    100,330.64x = 138,457.84 × 55,012.76
  4. Step 4: Simplify right side
    100,330.64x = 7,616,947,922.04
  5. Step 5: Solve for x
    x = 7,616,947,922.04/100,330.64
  6. Step 6: Final answer
    x = 75,918.46

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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.