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Finding the Fourth Proportional to 641,870.39, 885,808.81 and 355,390.48

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Solution

The fourth proportional to 641,870.39, 885,808.81 and 355,390.48 is: 490,454.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,870.39 : 885,808.81 = 355,390.48 : x
  2. Step 2: Convert to fraction form
    641,870.39/885,808.81 = 355,390.48/x
  3. Step 3: Cross multiply
    641,870.39x = 885,808.81 × 355,390.48
  4. Step 4: Simplify right side
    641,870.39x = 314,808,015,071.13
  5. Step 5: Solve for x
    x = 314,808,015,071.13/641,870.39
  6. Step 6: Final answer
    x = 490,454.18

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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.