Home / 138,356.10-190,931.79-80,985

Finding the Fourth Proportional to 138,356.10, 190,931.79 and 80,985

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Solution

The fourth proportional to 138,356.10, 190,931.79 and 80,985 is: 111,759.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,356.10 : 190,931.79 = 80,985 : x
  2. Step 2: Convert to fraction form
    138,356.10/190,931.79 = 80,985/x
  3. Step 3: Cross multiply
    138,356.10x = 190,931.79 × 80,985
  4. Step 4: Simplify right side
    138,356.10x = 15,462,611,013.15
  5. Step 5: Solve for x
    x = 15,462,611,013.15/138,356.10
  6. Step 6: Final answer
    x = 111,759.52

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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.