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Finding the Fourth Proportional to 647,608.20, 971,412.30 and 619,614.60

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Solution

The fourth proportional to 647,608.20, 971,412.30 and 619,614.60 is: 929,421.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,608.20 : 971,412.30 = 619,614.60 : x
  2. Step 2: Convert to fraction form
    647,608.20/971,412.30 = 619,614.60/x
  3. Step 3: Cross multiply
    647,608.20x = 971,412.30 × 619,614.60
  4. Step 4: Simplify right side
    647,608.20x = 601,901,243,699.58
  5. Step 5: Solve for x
    x = 601,901,243,699.58/647,608.20
  6. Step 6: Final answer
    x = 929,421.90

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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.