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Finding the Fourth Proportional to 708,474.90, 977,679.81 and 386,172.66

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Solution

The fourth proportional to 708,474.90, 977,679.81 and 386,172.66 is: 532,909.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,474.90 : 977,679.81 = 386,172.66 : x
  2. Step 2: Convert to fraction form
    708,474.90/977,679.81 = 386,172.66/x
  3. Step 3: Cross multiply
    708,474.90x = 977,679.81 × 386,172.66
  4. Step 4: Simplify right side
    708,474.90x = 377,553,212,856.00
  5. Step 5: Solve for x
    x = 377,553,212,856.00/708,474.90
  6. Step 6: Final answer
    x = 532,909.79

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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.