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Finding the Fourth Proportional to 665,428.64, 918,309.92 and 407,300.44

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Solution

The fourth proportional to 665,428.64, 918,309.92 and 407,300.44 is: 562,085.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,428.64 : 918,309.92 = 407,300.44 : x
  2. Step 2: Convert to fraction form
    665,428.64/918,309.92 = 407,300.44/x
  3. Step 3: Cross multiply
    665,428.64x = 918,309.92 × 407,300.44
  4. Step 4: Simplify right side
    665,428.64x = 374,028,034,472.37
  5. Step 5: Solve for x
    x = 374,028,034,472.37/665,428.64
  6. Step 6: Final answer
    x = 562,085.87

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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.