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Finding the Fourth Proportional to 520,043.30, 778,898.55 and 426,731.30

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Solution

The fourth proportional to 520,043.30, 778,898.55 and 426,731.30 is: 639,139.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,043.30 : 778,898.55 = 426,731.30 : x
  2. Step 2: Convert to fraction form
    520,043.30/778,898.55 = 426,731.30/x
  3. Step 3: Cross multiply
    520,043.30x = 778,898.55 × 426,731.30
  4. Step 4: Simplify right side
    520,043.30x = 332,380,390,809.62
  5. Step 5: Solve for x
    x = 332,380,390,809.62/520,043.30
  6. Step 6: Final answer
    x = 639,139.84

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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.