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Finding the Fourth Proportional to 485,221.16, 669,607.86 and 281,392.93

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Solution

The fourth proportional to 485,221.16, 669,607.86 and 281,392.93 is: 388,323.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,221.16 : 669,607.86 = 281,392.93 : x
  2. Step 2: Convert to fraction form
    485,221.16/669,607.86 = 281,392.93/x
  3. Step 3: Cross multiply
    485,221.16x = 669,607.86 × 281,392.93
  4. Step 4: Simplify right side
    485,221.16x = 188,422,917,458.22
  5. Step 5: Solve for x
    x = 188,422,917,458.22/485,221.16
  6. Step 6: Final answer
    x = 388,323.79

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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.