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Finding the Fourth Proportional to 639,690.48, 959,017.32 and 265,993.20

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Solution

The fourth proportional to 639,690.48, 959,017.32 and 265,993.20 is: 398,774.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,690.48 : 959,017.32 = 265,993.20 : x
  2. Step 2: Convert to fraction form
    639,690.48/959,017.32 = 265,993.20/x
  3. Step 3: Cross multiply
    639,690.48x = 959,017.32 × 265,993.20
  4. Step 4: Simplify right side
    639,690.48x = 255,092,085,802.22
  5. Step 5: Solve for x
    x = 255,092,085,802.22/639,690.48
  6. Step 6: Final answer
    x = 398,774.24

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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.