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Finding the Fourth Proportional to 402,679.83, 555,686.42 and 221,391.57

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Solution

The fourth proportional to 402,679.83, 555,686.42 and 221,391.57 is: 305,513.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,679.83 : 555,686.42 = 221,391.57 : x
  2. Step 2: Convert to fraction form
    402,679.83/555,686.42 = 221,391.57/x
  3. Step 3: Cross multiply
    402,679.83x = 555,686.42 × 221,391.57
  4. Step 4: Simplify right side
    402,679.83x = 123,024,287,844.52
  5. Step 5: Solve for x
    x = 123,024,287,844.52/402,679.83
  6. Step 6: Final answer
    x = 305,513.91

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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.