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Finding the Fourth Proportional to 389,213.40, 583,820.10 and 212,066.40

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Solution

The fourth proportional to 389,213.40, 583,820.10 and 212,066.40 is: 318,099.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,213.40 : 583,820.10 = 212,066.40 : x
  2. Step 2: Convert to fraction form
    389,213.40/583,820.10 = 212,066.40/x
  3. Step 3: Cross multiply
    389,213.40x = 583,820.10 × 212,066.40
  4. Step 4: Simplify right side
    389,213.40x = 123,808,626,854.64
  5. Step 5: Solve for x
    x = 123,808,626,854.64/389,213.40
  6. Step 6: Final answer
    x = 318,099.60

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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.