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Finding the Fourth Proportional to 78,894,684.60, 118,286,039.70 and 30,353,782.20

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Solution

The fourth proportional to 78,894,684.60, 118,286,039.70 and 30,353,782.20 is: 45,509,132.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,894,684.60 : 118,286,039.70 = 30,353,782.20 : x
  2. Step 2: Convert to fraction form
    78,894,684.60/118,286,039.70 = 30,353,782.20/x
  3. Step 3: Cross multiply
    78,894,684.60x = 118,286,039.70 × 30,353,782.20
  4. Step 4: Simplify right side
    78,894,684.60x = 3,590,428,686,354,353.50
  5. Step 5: Solve for x
    x = 3,590,428,686,354,353.50/78,894,684.60
  6. Step 6: Final answer
    x = 45,509,132.90

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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.