Home / 138,299.12-190,837-77,868.20

Finding the Fourth Proportional to 138,299.12, 190,837 and 77,868.20

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Solution

The fourth proportional to 138,299.12, 190,837 and 77,868.20 is: 107,449.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,299.12 : 190,837 = 77,868.20 : x
  2. Step 2: Convert to fraction form
    138,299.12/190,837 = 77,868.20/x
  3. Step 3: Cross multiply
    138,299.12x = 190,837 × 77,868.20
  4. Step 4: Simplify right side
    138,299.12x = 14,860,133,683.40
  5. Step 5: Solve for x
    x = 14,860,133,683.40/138,299.12
  6. Step 6: Final answer
    x = 107,449.23

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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.