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Finding the Fourth Proportional to 209,915.70, 314,873.55 and 76,800.30

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Solution

The fourth proportional to 209,915.70, 314,873.55 and 76,800.30 is: 115,200.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,915.70 : 314,873.55 = 76,800.30 : x
  2. Step 2: Convert to fraction form
    209,915.70/314,873.55 = 76,800.30/x
  3. Step 3: Cross multiply
    209,915.70x = 314,873.55 × 76,800.30
  4. Step 4: Simplify right side
    209,915.70x = 24,182,383,102.07
  5. Step 5: Solve for x
    x = 24,182,383,102.07/209,915.70
  6. Step 6: Final answer
    x = 115,200.45

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1.5x scale

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.