Home / 138,771.04-191,513.28-78,320.20

Finding the Fourth Proportional to 138,771.04, 191,513.28 and 78,320.20

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Solution

The fourth proportional to 138,771.04, 191,513.28 and 78,320.20 is: 108,087.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,771.04 : 191,513.28 = 78,320.20 : x
  2. Step 2: Convert to fraction form
    138,771.04/191,513.28 = 78,320.20/x
  3. Step 3: Cross multiply
    138,771.04x = 191,513.28 × 78,320.20
  4. Step 4: Simplify right side
    138,771.04x = 14,999,358,392.26
  5. Step 5: Solve for x
    x = 14,999,358,392.26/138,771.04
  6. Step 6: Final answer
    x = 108,087.09

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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.