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Finding the Fourth Proportional to 1,312,311, 1,810,989.18 and 708,699

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Solution

The fourth proportional to 1,312,311, 1,810,989.18 and 708,699 is: 978,004.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312,311 : 1,810,989.18 = 708,699 : x
  2. Step 2: Convert to fraction form
    1,312,311/1,810,989.18 = 708,699/x
  3. Step 3: Cross multiply
    1,312,311x = 1,810,989.18 × 708,699
  4. Step 4: Simplify right side
    1,312,311x = 1,283,446,220,876.82
  5. Step 5: Solve for x
    x = 1,283,446,220,876.82/1,312,311
  6. Step 6: Final answer
    x = 978,004.62

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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.