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Finding the Fourth Proportional to 260,010.30, 390,015.45 and 218,019.90

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Solution

The fourth proportional to 260,010.30, 390,015.45 and 218,019.90 is: 327,029.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,010.30 : 390,015.45 = 218,019.90 : x
  2. Step 2: Convert to fraction form
    260,010.30/390,015.45 = 218,019.90/x
  3. Step 3: Cross multiply
    260,010.30x = 390,015.45 × 218,019.90
  4. Step 4: Simplify right side
    260,010.30x = 85,031,129,407.46
  5. Step 5: Solve for x
    x = 85,031,129,407.46/260,010.30
  6. Step 6: Final answer
    x = 327,029.85

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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.