Home / 77,330.21-115,995.35-21,170.78

Finding the Fourth Proportional to 77,330.21, 115,995.35 and 21,170.78

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Solution

The fourth proportional to 77,330.21, 115,995.35 and 21,170.78 is: 31,756.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,330.21 : 115,995.35 = 21,170.78 : x
  2. Step 2: Convert to fraction form
    77,330.21/115,995.35 = 21,170.78/x
  3. Step 3: Cross multiply
    77,330.21x = 115,995.35 × 21,170.78
  4. Step 4: Simplify right side
    77,330.21x = 2,455,712,035.87
  5. Step 5: Solve for x
    x = 2,455,712,035.87/77,330.21
  6. Step 6: Final answer
    x = 31,756.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.