Home / 138,708.20-191,416.54-78,298.48

Finding the Fourth Proportional to 138,708.20, 191,416.54 and 78,298.48

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Solution

The fourth proportional to 138,708.20, 191,416.54 and 78,298.48 is: 108,051.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,708.20 : 191,416.54 = 78,298.48 : x
  2. Step 2: Convert to fraction form
    138,708.20/191,416.54 = 78,298.48/x
  3. Step 3: Cross multiply
    138,708.20x = 191,416.54 × 78,298.48
  4. Step 4: Simplify right side
    138,708.20x = 14,987,624,128.86
  5. Step 5: Solve for x
    x = 14,987,624,128.86/138,708.20
  6. Step 6: Final answer
    x = 108,051.46

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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.