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Finding the Fourth Proportional to 660,393,670.60, 990,590,505.90 and 430,811,158.60

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Solution

The fourth proportional to 660,393,670.60, 990,590,505.90 and 430,811,158.60 is: 646,216,737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,393,670.60 : 990,590,505.90 = 430,811,158.60 : x
  2. Step 2: Convert to fraction form
    660,393,670.60/990,590,505.90 = 430,811,158.60/x
  3. Step 3: Cross multiply
    660,393,670.60x = 990,590,505.90 × 430,811,158.60
  4. Step 4: Simplify right side
    660,393,670.60x = 426,757,443,544,939,136
  5. Step 5: Solve for x
    x = 426,757,443,544,939,136/660,393,670.60
  6. Step 6: Final answer
    x = 646,216,737.90

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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.