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Finding the Fourth Proportional to 390,255.36, 585,116.72 and 207,913.44

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Solution

The fourth proportional to 390,255.36, 585,116.72 and 207,913.44 is: 311,728.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,255.36 : 585,116.72 = 207,913.44 : x
  2. Step 2: Convert to fraction form
    390,255.36/585,116.72 = 207,913.44/x
  3. Step 3: Cross multiply
    390,255.36x = 585,116.72 × 207,913.44
  4. Step 4: Simplify right side
    390,255.36x = 121,653,630,056.72
  5. Step 5: Solve for x
    x = 121,653,630,056.72/390,255.36
  6. Step 6: Final answer
    x = 311,728.27

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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.