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Finding the Fourth Proportional to 402,480.16, 555,395.72 and 221,188.20

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Solution

The fourth proportional to 402,480.16, 555,395.72 and 221,188.20 is: 305,224.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,480.16 : 555,395.72 = 221,188.20 : x
  2. Step 2: Convert to fraction form
    402,480.16/555,395.72 = 221,188.20/x
  3. Step 3: Cross multiply
    402,480.16x = 555,395.72 × 221,188.20
  4. Step 4: Simplify right side
    402,480.16x = 122,846,979,594.50
  5. Step 5: Solve for x
    x = 122,846,979,594.50/402,480.16
  6. Step 6: Final answer
    x = 305,224.93

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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.