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Finding the Fourth Proportional to 718,744,137.75, 991,866,911.72 and 388,719,276.75

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Solution

The fourth proportional to 718,744,137.75, 991,866,911.72 and 388,719,276.75 is: 536,432,602.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,744,137.75 : 991,866,911.72 = 388,719,276.75 : x
  2. Step 2: Convert to fraction form
    718,744,137.75/991,866,911.72 = 388,719,276.75/x
  3. Step 3: Cross multiply
    718,744,137.75x = 991,866,911.72 × 388,719,276.75
  4. Step 4: Simplify right side
    718,744,137.75x = 385,557,788,554,110,912
  5. Step 5: Solve for x
    x = 385,557,788,554,110,912/718,744,137.75
  6. Step 6: Final answer
    x = 536,432,602.79

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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.