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Finding the Fourth Proportional to 457,999.80, 686,999.70 and 318,031.80

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Solution

The fourth proportional to 457,999.80, 686,999.70 and 318,031.80 is: 477,047.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,999.80 : 686,999.70 = 318,031.80 : x
  2. Step 2: Convert to fraction form
    457,999.80/686,999.70 = 318,031.80/x
  3. Step 3: Cross multiply
    457,999.80x = 686,999.70 × 318,031.80
  4. Step 4: Simplify right side
    457,999.80x = 218,487,751,190.46
  5. Step 5: Solve for x
    x = 218,487,751,190.46/457,999.80
  6. Step 6: Final answer
    x = 477,047.70

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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.