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Finding the Fourth Proportional to 661,309.23, 911,750.15 and 428,321.64

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Solution

The fourth proportional to 661,309.23, 911,750.15 and 428,321.64 is: 590,529.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,309.23 : 911,750.15 = 428,321.64 : x
  2. Step 2: Convert to fraction form
    661,309.23/911,750.15 = 428,321.64/x
  3. Step 3: Cross multiply
    661,309.23x = 911,750.15 × 428,321.64
  4. Step 4: Simplify right side
    661,309.23x = 390,522,319,518.25
  5. Step 5: Solve for x
    x = 390,522,319,518.25/661,309.23
  6. Step 6: Final answer
    x = 590,529.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.