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Finding the Fourth Proportional to 390,018.90, 585,028.35 and 153,369.30

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Solution

The fourth proportional to 390,018.90, 585,028.35 and 153,369.30 is: 230,053.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,018.90 : 585,028.35 = 153,369.30 : x
  2. Step 2: Convert to fraction form
    390,018.90/585,028.35 = 153,369.30/x
  3. Step 3: Cross multiply
    390,018.90x = 585,028.35 × 153,369.30
  4. Step 4: Simplify right side
    390,018.90x = 89,725,388,519.66
  5. Step 5: Solve for x
    x = 89,725,388,519.66/390,018.90
  6. Step 6: Final answer
    x = 230,053.95

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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.