Home / 100,740.16-138,816.24-77,940.64

Finding the Fourth Proportional to 100,740.16, 138,816.24 and 77,940.64

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Solution

The fourth proportional to 100,740.16, 138,816.24 and 77,940.64 is: 107,399.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,740.16 : 138,816.24 = 77,940.64 : x
  2. Step 2: Convert to fraction form
    100,740.16/138,816.24 = 77,940.64/x
  3. Step 3: Cross multiply
    100,740.16x = 138,816.24 × 77,940.64
  4. Step 4: Simplify right side
    100,740.16x = 10,819,426,587.99
  5. Step 5: Solve for x
    x = 10,819,426,587.99/100,740.16
  6. Step 6: Final answer
    x = 107,399.34

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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.