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Finding the Fourth Proportional to 380,738.70, 570,706.14 and 127,779.30

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Solution

The fourth proportional to 380,738.70, 570,706.14 and 127,779.30 is: 191,534.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    380,738.70 : 570,706.14 = 127,779.30 : x
  2. Step 2: Convert to fraction form
    380,738.70/570,706.14 = 127,779.30/x
  3. Step 3: Cross multiply
    380,738.70x = 570,706.14 × 127,779.30
  4. Step 4: Simplify right side
    380,738.70x = 72,924,431,074.90
  5. Step 5: Solve for x
    x = 72,924,431,074.90/380,738.70
  6. Step 6: Final answer
    x = 191,534.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.