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Finding the Fourth Proportional to 805,978.20, 1,207,217.70 and 666,010.20

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Solution

The fourth proportional to 805,978.20, 1,207,217.70 and 666,010.20 is: 997,569.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    805,978.20 : 1,207,217.70 = 666,010.20 : x
  2. Step 2: Convert to fraction form
    805,978.20/1,207,217.70 = 666,010.20/x
  3. Step 3: Cross multiply
    805,978.20x = 1,207,217.70 × 666,010.20
  4. Step 4: Simplify right side
    805,978.20x = 804,019,301,820.54
  5. Step 5: Solve for x
    x = 804,019,301,820.54/805,978.20
  6. Step 6: Final answer
    x = 997,569.54

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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.