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Finding the Fourth Proportional to 505,063.40, 696,986.64 and 278,708.72

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Solution

The fourth proportional to 505,063.40, 696,986.64 and 278,708.72 is: 384,617.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    505,063.40 : 696,986.64 = 278,708.72 : x
  2. Step 2: Convert to fraction form
    505,063.40/696,986.64 = 278,708.72/x
  3. Step 3: Cross multiply
    505,063.40x = 696,986.64 × 278,708.72
  4. Step 4: Simplify right side
    505,063.40x = 194,256,254,291.50
  5. Step 5: Solve for x
    x = 194,256,254,291.50/505,063.40
  6. Step 6: Final answer
    x = 384,617.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.