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Finding the Fourth Proportional to 665,421.63, 918,300.26 and 407,293.44

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Solution

The fourth proportional to 665,421.63, 918,300.26 and 407,293.44 is: 562,076.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,421.63 : 918,300.26 = 407,293.44 : x
  2. Step 2: Convert to fraction form
    665,421.63/918,300.26 = 407,293.44/x
  3. Step 3: Cross multiply
    665,421.63x = 918,300.26 × 407,293.44
  4. Step 4: Simplify right side
    665,421.63x = 374,017,672,866.53
  5. Step 5: Solve for x
    x = 374,017,672,866.53/665,421.63
  6. Step 6: Final answer
    x = 562,076.22

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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.