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Finding the Fourth Proportional to 641,890.88, 885,737.88 and 355,339.20

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Solution

The fourth proportional to 641,890.88, 885,737.88 and 355,339.20 is: 490,328.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,890.88 : 885,737.88 = 355,339.20 : x
  2. Step 2: Convert to fraction form
    641,890.88/885,737.88 = 355,339.20/x
  3. Step 3: Cross multiply
    641,890.88x = 885,737.88 × 355,339.20
  4. Step 4: Simplify right side
    641,890.88x = 314,737,389,688.90
  5. Step 5: Solve for x
    x = 314,737,389,688.90/641,890.88
  6. Step 6: Final answer
    x = 490,328.50

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1.5x scale

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.