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Finding the Fourth Proportional to 659,466.40, 989,199.60 and 431,143.60

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Solution

The fourth proportional to 659,466.40, 989,199.60 and 431,143.60 is: 646,715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,466.40 : 989,199.60 = 431,143.60 : x
  2. Step 2: Convert to fraction form
    659,466.40/989,199.60 = 431,143.60/x
  3. Step 3: Cross multiply
    659,466.40x = 989,199.60 × 431,143.60
  4. Step 4: Simplify right side
    659,466.40x = 426,487,076,662.56
  5. Step 5: Solve for x
    x = 426,487,076,662.56/659,466.40
  6. Step 6: Final answer
    x = 646,715.40

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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.