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Finding the Fourth Proportional to 390,279.72, 584,999.64 and 255,292.86

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Solution

The fourth proportional to 390,279.72, 584,999.64 and 255,292.86 is: 382,664.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,279.72 : 584,999.64 = 255,292.86 : x
  2. Step 2: Convert to fraction form
    390,279.72/584,999.64 = 255,292.86/x
  3. Step 3: Cross multiply
    390,279.72x = 584,999.64 × 255,292.86
  4. Step 4: Simplify right side
    390,279.72x = 149,346,231,194.57
  5. Step 5: Solve for x
    x = 149,346,231,194.57/390,279.72
  6. Step 6: Final answer
    x = 382,664.60

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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.