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Finding the Fourth Proportional to 212,421,794.40, 318,065,821.20 and 212,421,794.40

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Solution

The fourth proportional to 212,421,794.40, 318,065,821.20 and 212,421,794.40 is: 318,065,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,421,794.40 : 318,065,821.20 = 212,421,794.40 : x
  2. Step 2: Convert to fraction form
    212,421,794.40/318,065,821.20 = 212,421,794.40/x
  3. Step 3: Cross multiply
    212,421,794.40x = 318,065,821.20 × 212,421,794.40
  4. Step 4: Simplify right side
    212,421,794.40x = 67,564,112,476,613,560
  5. Step 5: Solve for x
    x = 67,564,112,476,613,560/212,421,794.40
  6. Step 6: Final answer
    x = 318,065,821.20

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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.