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Finding the Fourth Proportional to 328,479.40, 492,719.10 and 257,620.60

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Solution

The fourth proportional to 328,479.40, 492,719.10 and 257,620.60 is: 386,430.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,479.40 : 492,719.10 = 257,620.60 : x
  2. Step 2: Convert to fraction form
    328,479.40/492,719.10 = 257,620.60/x
  3. Step 3: Cross multiply
    328,479.40x = 492,719.10 × 257,620.60
  4. Step 4: Simplify right side
    328,479.40x = 126,934,590,173.46
  5. Step 5: Solve for x
    x = 126,934,590,173.46/328,479.40
  6. Step 6: Final answer
    x = 386,430.90

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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.