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Finding the Fourth Proportional to 486,684.42, 671,956.56 and 315,017.88

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Solution

The fourth proportional to 486,684.42, 671,956.56 and 315,017.88 is: 434,939.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,684.42 : 671,956.56 = 315,017.88 : x
  2. Step 2: Convert to fraction form
    486,684.42/671,956.56 = 315,017.88/x
  3. Step 3: Cross multiply
    486,684.42x = 671,956.56 × 315,017.88
  4. Step 4: Simplify right side
    486,684.42x = 211,678,330,983.29
  5. Step 5: Solve for x
    x = 211,678,330,983.29/486,684.42
  6. Step 6: Final answer
    x = 434,939.61

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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.