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Finding the Fourth Proportional to 665,255.56, 918,053.58 and 378,775.78

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Solution

The fourth proportional to 665,255.56, 918,053.58 and 378,775.78 is: 522,711.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,255.56 : 918,053.58 = 378,775.78 : x
  2. Step 2: Convert to fraction form
    665,255.56/918,053.58 = 378,775.78/x
  3. Step 3: Cross multiply
    665,255.56x = 918,053.58 × 378,775.78
  4. Step 4: Simplify right side
    665,255.56x = 347,736,460,846.29
  5. Step 5: Solve for x
    x = 347,736,460,846.29/665,255.56
  6. Step 6: Final answer
    x = 522,711.09

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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.