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Finding the Fourth Proportional to 390,636.81, 585,036.36 and 190,329.48

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Solution

The fourth proportional to 390,636.81, 585,036.36 and 190,329.48 is: 285,046.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,636.81 : 585,036.36 = 190,329.48 : x
  2. Step 2: Convert to fraction form
    390,636.81/585,036.36 = 190,329.48/x
  3. Step 3: Cross multiply
    390,636.81x = 585,036.36 × 190,329.48
  4. Step 4: Simplify right side
    390,636.81x = 111,349,666,179.89
  5. Step 5: Solve for x
    x = 111,349,666,179.89/390,636.81
  6. Step 6: Final answer
    x = 285,046.53

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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.