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Finding the Fourth Proportional to 391,036.16, 539,628 and 212,188.16

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Solution

The fourth proportional to 391,036.16, 539,628 and 212,188.16 is: 292,818.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,036.16 : 539,628 = 212,188.16 : x
  2. Step 2: Convert to fraction form
    391,036.16/539,628 = 212,188.16/x
  3. Step 3: Cross multiply
    391,036.16x = 539,628 × 212,188.16
  4. Step 4: Simplify right side
    391,036.16x = 114,502,672,404.48
  5. Step 5: Solve for x
    x = 114,502,672,404.48/391,036.16
  6. Step 6: Final answer
    x = 292,818.63

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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.