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Finding the Fourth Proportional to 402,270.78, 555,137.20 and 220,986.40

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Solution

The fourth proportional to 402,270.78, 555,137.20 and 220,986.40 is: 304,963.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,270.78 : 555,137.20 = 220,986.40 : x
  2. Step 2: Convert to fraction form
    402,270.78/555,137.20 = 220,986.40/x
  3. Step 3: Cross multiply
    402,270.78x = 555,137.20 × 220,986.40
  4. Step 4: Simplify right side
    402,270.78x = 122,677,771,334.08
  5. Step 5: Solve for x
    x = 122,677,771,334.08/402,270.78
  6. Step 6: Final answer
    x = 304,963.17

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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.