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Finding the Fourth Proportional to 718,744,215, 991,867,018.32 and 388,719,354

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Solution

The fourth proportional to 718,744,215, 991,867,018.32 and 388,719,354 is: 536,432,709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,744,215 : 991,867,018.32 = 388,719,354 : x
  2. Step 2: Convert to fraction form
    718,744,215/991,867,018.32 = 388,719,354/x
  3. Step 3: Cross multiply
    718,744,215x = 991,867,018.32 × 388,719,354
  4. Step 4: Simplify right side
    718,744,215x = 385,557,906,615,256,576
  5. Step 5: Solve for x
    x = 385,557,906,615,256,576/718,744,215
  6. Step 6: Final answer
    x = 536,432,709.40

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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.