Home / 100,400.48-138,554.51-55,080.78

Finding the Fourth Proportional to 100,400.48, 138,554.51 and 55,080.78

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Solution

The fourth proportional to 100,400.48, 138,554.51 and 55,080.78 is: 76,012.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,400.48 : 138,554.51 = 55,080.78 : x
  2. Step 2: Convert to fraction form
    100,400.48/138,554.51 = 55,080.78/x
  3. Step 3: Cross multiply
    100,400.48x = 138,554.51 × 55,080.78
  4. Step 4: Simplify right side
    100,400.48x = 7,631,690,483.32
  5. Step 5: Solve for x
    x = 7,631,690,483.32/100,400.48
  6. Step 6: Final answer
    x = 76,012.49

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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.