Home / 138,678.72-191,390.59-84,999.42

Finding the Fourth Proportional to 138,678.72, 191,390.59 and 84,999.42

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Solution

The fourth proportional to 138,678.72, 191,390.59 and 84,999.42 is: 117,307.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,678.72 : 191,390.59 = 84,999.42 : x
  2. Step 2: Convert to fraction form
    138,678.72/191,390.59 = 84,999.42/x
  3. Step 3: Cross multiply
    138,678.72x = 191,390.59 × 84,999.42
  4. Step 4: Simplify right side
    138,678.72x = 16,268,089,143.46
  5. Step 5: Solve for x
    x = 16,268,089,143.46/138,678.72
  6. Step 6: Final answer
    x = 117,307.75

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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.