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Finding the Fourth Proportional to 338,669.80, 507,812.70 and 128,314.60

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Solution

The fourth proportional to 338,669.80, 507,812.70 and 128,314.60 is: 192,399.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,669.80 : 507,812.70 = 128,314.60 : x
  2. Step 2: Convert to fraction form
    338,669.80/507,812.70 = 128,314.60/x
  3. Step 3: Cross multiply
    338,669.80x = 507,812.70 × 128,314.60
  4. Step 4: Simplify right side
    338,669.80x = 65,159,783,475.42
  5. Step 5: Solve for x
    x = 65,159,783,475.42/338,669.80
  6. Step 6: Final answer
    x = 192,399.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.