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Finding the Fourth Proportional to 520,211.80, 780,339.30 and 165,215.80

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Solution

The fourth proportional to 520,211.80, 780,339.30 and 165,215.80 is: 247,830.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,211.80 : 780,339.30 = 165,215.80 : x
  2. Step 2: Convert to fraction form
    520,211.80/780,339.30 = 165,215.80/x
  3. Step 3: Cross multiply
    520,211.80x = 780,339.30 × 165,215.80
  4. Step 4: Simplify right side
    520,211.80x = 128,924,381,720.94
  5. Step 5: Solve for x
    x = 128,924,381,720.94/520,211.80
  6. Step 6: Final answer
    x = 247,830.56

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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.