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Finding the Fourth Proportional to 665,893.68, 918,723.90 and 407,501.25

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Solution

The fourth proportional to 665,893.68, 918,723.90 and 407,501.25 is: 562,223.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,893.68 : 918,723.90 = 407,501.25 : x
  2. Step 2: Convert to fraction form
    665,893.68/918,723.90 = 407,501.25/x
  3. Step 3: Cross multiply
    665,893.68x = 918,723.90 × 407,501.25
  4. Step 4: Simplify right side
    665,893.68x = 374,381,137,654.88
  5. Step 5: Solve for x
    x = 374,381,137,654.88/665,893.68
  6. Step 6: Final answer
    x = 562,223.59

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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.