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Finding the Fourth Proportional to 391,009.51, 539,592.87 and 212,161.51

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Solution

The fourth proportional to 391,009.51, 539,592.87 and 212,161.51 is: 292,782.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,009.51 : 539,592.87 = 212,161.51 : x
  2. Step 2: Convert to fraction form
    391,009.51/539,592.87 = 212,161.51/x
  3. Step 3: Cross multiply
    391,009.51x = 539,592.87 × 212,161.51
  4. Step 4: Simplify right side
    391,009.51x = 114,480,838,084.43
  5. Step 5: Solve for x
    x = 114,480,838,084.43/391,009.51
  6. Step 6: Final answer
    x = 292,782.75

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1.5x scale

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.