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Finding the Fourth Proportional to 100,700.69, 138,964.18 and 55,378.67

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Solution

The fourth proportional to 100,700.69, 138,964.18 and 55,378.67 is: 76,421.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,700.69 : 138,964.18 = 55,378.67 : x
  2. Step 2: Convert to fraction form
    100,700.69/138,964.18 = 55,378.67/x
  3. Step 3: Cross multiply
    100,700.69x = 138,964.18 × 55,378.67
  4. Step 4: Simplify right side
    100,700.69x = 7,695,651,518.28
  5. Step 5: Solve for x
    x = 7,695,651,518.28/100,700.69
  6. Step 6: Final answer
    x = 76,421.04

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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.