Home / 138,435.06-191,036.40-78,004.60

Finding the Fourth Proportional to 138,435.06, 191,036.40 and 78,004.60

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Solution

The fourth proportional to 138,435.06, 191,036.40 and 78,004.60 is: 107,644.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,435.06 : 191,036.40 = 78,004.60 : x
  2. Step 2: Convert to fraction form
    138,435.06/191,036.40 = 78,004.60/x
  3. Step 3: Cross multiply
    138,435.06x = 191,036.40 × 78,004.60
  4. Step 4: Simplify right side
    138,435.06x = 14,901,717,967.44
  5. Step 5: Solve for x
    x = 14,901,717,967.44/138,435.06
  6. Step 6: Final answer
    x = 107,644.10

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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.