Home / 138,420.55-191,017.20-84,705.40

Finding the Fourth Proportional to 138,420.55, 191,017.20 and 84,705.40

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Solution

The fourth proportional to 138,420.55, 191,017.20 and 84,705.40 is: 116,891.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,420.55 : 191,017.20 = 84,705.40 : x
  2. Step 2: Convert to fraction form
    138,420.55/191,017.20 = 84,705.40/x
  3. Step 3: Cross multiply
    138,420.55x = 191,017.20 × 84,705.40
  4. Step 4: Simplify right side
    138,420.55x = 16,180,188,332.88
  5. Step 5: Solve for x
    x = 16,180,188,332.88/138,420.55
  6. Step 6: Final answer
    x = 116,891.52

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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.