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Finding the Fourth Proportional to 390,073.20, 584,706.60 and 212,204.40

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Solution

The fourth proportional to 390,073.20, 584,706.60 and 212,204.40 is: 318,087.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,073.20 : 584,706.60 = 212,204.40 : x
  2. Step 2: Convert to fraction form
    390,073.20/584,706.60 = 212,204.40/x
  3. Step 3: Cross multiply
    390,073.20x = 584,706.60 × 212,204.40
  4. Step 4: Simplify right side
    390,073.20x = 124,077,313,229.04
  5. Step 5: Solve for x
    x = 124,077,313,229.04/390,073.20
  6. Step 6: Final answer
    x = 318,087.25

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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.