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Finding the Fourth Proportional to 808,657.80, 1,212,986.70 and 721,566.60

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Solution

The fourth proportional to 808,657.80, 1,212,986.70 and 721,566.60 is: 1,082,349.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    808,657.80 : 1,212,986.70 = 721,566.60 : x
  2. Step 2: Convert to fraction form
    808,657.80/1,212,986.70 = 721,566.60/x
  3. Step 3: Cross multiply
    808,657.80x = 1,212,986.70 × 721,566.60
  4. Step 4: Simplify right side
    808,657.80x = 875,250,688,964.22
  5. Step 5: Solve for x
    x = 875,250,688,964.22/808,657.80
  6. Step 6: Final answer
    x = 1,082,349.90

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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.