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Finding the Fourth Proportional to 390,390.40, 585,196.80 and 179,660.80

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Solution

The fourth proportional to 390,390.40, 585,196.80 and 179,660.80 is: 269,312.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,390.40 : 585,196.80 = 179,660.80 : x
  2. Step 2: Convert to fraction form
    390,390.40/585,196.80 = 179,660.80/x
  3. Step 3: Cross multiply
    390,390.40x = 585,196.80 × 179,660.80
  4. Step 4: Simplify right side
    390,390.40x = 105,136,925,245.44
  5. Step 5: Solve for x
    x = 105,136,925,245.44/390,390.40
  6. Step 6: Final answer
    x = 269,312.27

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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.