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Finding the Fourth Proportional to 520,070.80, 780,106.20 and 380,102.80

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Solution

The fourth proportional to 520,070.80, 780,106.20 and 380,102.80 is: 570,154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,070.80 : 780,106.20 = 380,102.80 : x
  2. Step 2: Convert to fraction form
    520,070.80/780,106.20 = 380,102.80/x
  3. Step 3: Cross multiply
    520,070.80x = 780,106.20 × 380,102.80
  4. Step 4: Simplify right side
    520,070.80x = 296,520,550,917.36
  5. Step 5: Solve for x
    x = 296,520,550,917.36/520,070.80
  6. Step 6: Final answer
    x = 570,154.20

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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.