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Finding the Fourth Proportional to 407,128.86, 561,321.20 and 290,980.94

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Solution

The fourth proportional to 407,128.86, 561,321.20 and 290,980.94 is: 401,184.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,128.86 : 561,321.20 = 290,980.94 : x
  2. Step 2: Convert to fraction form
    407,128.86/561,321.20 = 290,980.94/x
  3. Step 3: Cross multiply
    407,128.86x = 561,321.20 × 290,980.94
  4. Step 4: Simplify right side
    407,128.86x = 163,333,770,417.93
  5. Step 5: Solve for x
    x = 163,333,770,417.93/407,128.86
  6. Step 6: Final answer
    x = 401,184.46

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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.