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Finding the Fourth Proportional to 459,031.20, 686,991.60 and 459,031.20

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Solution

The fourth proportional to 459,031.20, 686,991.60 and 459,031.20 is: 686,991.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,031.20 : 686,991.60 = 459,031.20 : x
  2. Step 2: Convert to fraction form
    459,031.20/686,991.60 = 459,031.20/x
  3. Step 3: Cross multiply
    459,031.20x = 686,991.60 × 459,031.20
  4. Step 4: Simplify right side
    459,031.20x = 315,350,578,537.92
  5. Step 5: Solve for x
    x = 315,350,578,537.92/459,031.20
  6. Step 6: Final answer
    x = 686,991.60

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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.