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Finding the Fourth Proportional to 641,870.52, 885,808.98 and 355,390.60

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Solution

The fourth proportional to 641,870.52, 885,808.98 and 355,390.60 is: 490,454.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,870.52 : 885,808.98 = 355,390.60 : x
  2. Step 2: Convert to fraction form
    641,870.52/885,808.98 = 355,390.60/x
  3. Step 3: Cross multiply
    641,870.52x = 885,808.98 × 355,390.60
  4. Step 4: Simplify right side
    641,870.52x = 314,808,187,102.11
  5. Step 5: Solve for x
    x = 314,808,187,102.11/641,870.52
  6. Step 6: Final answer
    x = 490,454.35

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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.