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Finding the Fourth Proportional to 288,690.64, 432,984.88 and 78,344.96

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Solution

The fourth proportional to 288,690.64, 432,984.88 and 78,344.96 is: 117,503.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,690.64 : 432,984.88 = 78,344.96 : x
  2. Step 2: Convert to fraction form
    288,690.64/432,984.88 = 78,344.96/x
  3. Step 3: Cross multiply
    288,690.64x = 432,984.88 × 78,344.96
  4. Step 4: Simplify right side
    288,690.64x = 33,922,183,104.20
  5. Step 5: Solve for x
    x = 33,922,183,104.20/288,690.64
  6. Step 6: Final answer
    x = 117,503.58

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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.