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Finding the Fourth Proportional to 660,820.88, 911,915.07 and 388,904.78

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Solution

The fourth proportional to 660,820.88, 911,915.07 and 388,904.78 is: 536,678.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,820.88 : 911,915.07 = 388,904.78 : x
  2. Step 2: Convert to fraction form
    660,820.88/911,915.07 = 388,904.78/x
  3. Step 3: Cross multiply
    660,820.88x = 911,915.07 × 388,904.78
  4. Step 4: Simplify right side
    660,820.88x = 354,648,129,677.04
  5. Step 5: Solve for x
    x = 354,648,129,677.04/660,820.88
  6. Step 6: Final answer
    x = 536,678.15

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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.