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Finding the Fourth Proportional to 660,659.40, 990,653.76 and 281,433.60

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Solution

The fourth proportional to 660,659.40, 990,653.76 and 281,433.60 is: 422,007.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,659.40 : 990,653.76 = 281,433.60 : x
  2. Step 2: Convert to fraction form
    660,659.40/990,653.76 = 281,433.60/x
  3. Step 3: Cross multiply
    660,659.40x = 990,653.76 × 281,433.60
  4. Step 4: Simplify right side
    660,659.40x = 278,803,254,030.34
  5. Step 5: Solve for x
    x = 278,803,254,030.34/660,659.40
  6. Step 6: Final answer
    x = 422,007.55

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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.