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Finding the Fourth Proportional to 308,984.40, 426,178.44 and 283,572.72

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Solution

The fourth proportional to 308,984.40, 426,178.44 and 283,572.72 is: 391,128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,984.40 : 426,178.44 = 283,572.72 : x
  2. Step 2: Convert to fraction form
    308,984.40/426,178.44 = 283,572.72/x
  3. Step 3: Cross multiply
    308,984.40x = 426,178.44 × 283,572.72
  4. Step 4: Simplify right side
    308,984.40x = 120,852,579,436.16
  5. Step 5: Solve for x
    x = 120,852,579,436.16/308,984.40
  6. Step 6: Final answer
    x = 391,128.42

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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.