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Finding the Fourth Proportional to 708,687.72, 977,996.70 and 386,395.20

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Solution

The fourth proportional to 708,687.72, 977,996.70 and 386,395.20 is: 533,229.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,687.72 : 977,996.70 = 386,395.20 : x
  2. Step 2: Convert to fraction form
    708,687.72/977,996.70 = 386,395.20/x
  3. Step 3: Cross multiply
    708,687.72x = 977,996.70 × 386,395.20
  4. Step 4: Simplify right side
    708,687.72x = 377,893,230,495.84
  5. Step 5: Solve for x
    x = 377,893,230,495.84/708,687.72
  6. Step 6: Final answer
    x = 533,229.55

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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.