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Finding the Fourth Proportional to 987,428.89, 1,363,194.19 and 620,289

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Solution

The fourth proportional to 987,428.89, 1,363,194.19 and 620,289 is: 856,339.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    987,428.89 : 1,363,194.19 = 620,289 : x
  2. Step 2: Convert to fraction form
    987,428.89/1,363,194.19 = 620,289/x
  3. Step 3: Cross multiply
    987,428.89x = 1,363,194.19 × 620,289
  4. Step 4: Simplify right side
    987,428.89x = 845,574,361,696.27
  5. Step 5: Solve for x
    x = 845,574,361,696.27/987,428.89
  6. Step 6: Final answer
    x = 856,339.50

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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.