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Finding the Fourth Proportional to 665,214.63, 918,160.25 and 378,903.93

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Solution

The fourth proportional to 665,214.63, 918,160.25 and 378,903.93 is: 522,980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,214.63 : 918,160.25 = 378,903.93 : x
  2. Step 2: Convert to fraction form
    665,214.63/918,160.25 = 378,903.93/x
  3. Step 3: Cross multiply
    665,214.63x = 918,160.25 × 378,903.93
  4. Step 4: Simplify right side
    665,214.63x = 347,894,525,200.26
  5. Step 5: Solve for x
    x = 347,894,525,200.26/665,214.63
  6. Step 6: Final answer
    x = 522,980.87

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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.