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Finding the Fourth Proportional to 402,608.40, 555,538.72 and 221,328

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Solution

The fourth proportional to 402,608.40, 555,538.72 and 221,328 is: 305,399.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,608.40 : 555,538.72 = 221,328 : x
  2. Step 2: Convert to fraction form
    402,608.40/555,538.72 = 221,328/x
  3. Step 3: Cross multiply
    402,608.40x = 555,538.72 × 221,328
  4. Step 4: Simplify right side
    402,608.40x = 122,956,273,820.16
  5. Step 5: Solve for x
    x = 122,956,273,820.16/402,608.40
  6. Step 6: Final answer
    x = 305,399.18

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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.