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Finding the Fourth Proportional to 708,997.70, 978,428.48 and 386,707.81

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Solution

The fourth proportional to 708,997.70, 978,428.48 and 386,707.81 is: 533,663.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,997.70 : 978,428.48 = 386,707.81 : x
  2. Step 2: Convert to fraction form
    708,997.70/978,428.48 = 386,707.81/x
  3. Step 3: Cross multiply
    708,997.70x = 978,428.48 × 386,707.81
  4. Step 4: Simplify right side
    708,997.70x = 378,365,934,742.43
  5. Step 5: Solve for x
    x = 378,365,934,742.43/708,997.70
  6. Step 6: Final answer
    x = 533,663.13

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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.