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Finding the Fourth Proportional to 391,072.48, 539,680 and 212,224.48

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Solution

The fourth proportional to 391,072.48, 539,680 and 212,224.48 is: 292,869.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,072.48 : 539,680 = 212,224.48 : x
  2. Step 2: Convert to fraction form
    391,072.48/539,680 = 212,224.48/x
  3. Step 3: Cross multiply
    391,072.48x = 539,680 × 212,224.48
  4. Step 4: Simplify right side
    391,072.48x = 114,533,307,366.40
  5. Step 5: Solve for x
    x = 114,533,307,366.40/391,072.48
  6. Step 6: Final answer
    x = 292,869.77

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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.