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Finding the Fourth Proportional to 665,001, 917,707.21 and 378,539.51

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Solution

The fourth proportional to 665,001, 917,707.21 and 378,539.51 is: 522,387.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,001 : 917,707.21 = 378,539.51 : x
  2. Step 2: Convert to fraction form
    665,001/917,707.21 = 378,539.51/x
  3. Step 3: Cross multiply
    665,001x = 917,707.21 × 378,539.51
  4. Step 4: Simplify right side
    665,001x = 347,388,432,061.98
  5. Step 5: Solve for x
    x = 347,388,432,061.98/665,001
  6. Step 6: Final answer
    x = 522,387.83

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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.