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Finding the Fourth Proportional to 660,808.70, 911,898.28 and 388,892.62

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Solution

The fourth proportional to 660,808.70, 911,898.28 and 388,892.62 is: 536,661.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,808.70 : 911,898.28 = 388,892.62 : x
  2. Step 2: Convert to fraction form
    660,808.70/911,898.28 = 388,892.62/x
  3. Step 3: Cross multiply
    660,808.70x = 911,898.28 × 388,892.62
  4. Step 4: Simplify right side
    660,808.70x = 354,630,511,282.69
  5. Step 5: Solve for x
    x = 354,630,511,282.69/660,808.70
  6. Step 6: Final answer
    x = 536,661.38

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1.5x scale

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.