Home / 138,000.33-190,439.51-78,384.33

Finding the Fourth Proportional to 138,000.33, 190,439.51 and 78,384.33

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Solution

The fourth proportional to 138,000.33, 190,439.51 and 78,384.33 is: 108,169.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,000.33 : 190,439.51 = 78,384.33 : x
  2. Step 2: Convert to fraction form
    138,000.33/190,439.51 = 78,384.33/x
  3. Step 3: Cross multiply
    138,000.33x = 190,439.51 × 78,384.33
  4. Step 4: Simplify right side
    138,000.33x = 14,927,473,004.96
  5. Step 5: Solve for x
    x = 14,927,473,004.96/138,000.33
  6. Step 6: Final answer
    x = 108,169.84

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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.