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Finding the Fourth Proportional to 859,999.80, 1,289,999.70 and 220,302.30

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Solution

The fourth proportional to 859,999.80, 1,289,999.70 and 220,302.30 is: 330,453.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,999.80 : 1,289,999.70 = 220,302.30 : x
  2. Step 2: Convert to fraction form
    859,999.80/1,289,999.70 = 220,302.30/x
  3. Step 3: Cross multiply
    859,999.80x = 1,289,999.70 × 220,302.30
  4. Step 4: Simplify right side
    859,999.80x = 284,189,900,909.31
  5. Step 5: Solve for x
    x = 284,189,900,909.31/859,999.80
  6. Step 6: Final answer
    x = 330,453.45

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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.