Home / 687,789.90-1,031,830.65-207,978.30

Finding the Fourth Proportional to 687,789.90, 1,031,830.65 and 207,978.30

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Solution

The fourth proportional to 687,789.90, 1,031,830.65 and 207,978.30 is: 312,011.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,789.90 : 1,031,830.65 = 207,978.30 : x
  2. Step 2: Convert to fraction form
    687,789.90/1,031,830.65 = 207,978.30/x
  3. Step 3: Cross multiply
    687,789.90x = 1,031,830.65 × 207,978.30
  4. Step 4: Simplify right side
    687,789.90x = 214,598,384,474.90
  5. Step 5: Solve for x
    x = 214,598,384,474.90/687,789.90
  6. Step 6: Final answer
    x = 312,011.54

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1.5x scale

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.