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Finding the Fourth Proportional to 391,000, 539,582.88 and 212,152

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Solution

The fourth proportional to 391,000, 539,582.88 and 212,152 is: 292,771.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,000 : 539,582.88 = 212,152 : x
  2. Step 2: Convert to fraction form
    391,000/539,582.88 = 212,152/x
  3. Step 3: Cross multiply
    391,000x = 539,582.88 × 212,152
  4. Step 4: Simplify right side
    391,000x = 114,473,587,157.76
  5. Step 5: Solve for x
    x = 114,473,587,157.76/391,000
  6. Step 6: Final answer
    x = 292,771.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.