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Finding the Fourth Proportional to 641,870.64, 885,809.15 and 355,390.73

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Solution

The fourth proportional to 641,870.64, 885,809.15 and 355,390.73 is: 490,454.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,870.64 : 885,809.15 = 355,390.73 : x
  2. Step 2: Convert to fraction form
    641,870.64/885,809.15 = 355,390.73/x
  3. Step 3: Cross multiply
    641,870.64x = 885,809.15 × 355,390.73
  4. Step 4: Simplify right side
    641,870.64x = 314,808,360,459.18
  5. Step 5: Solve for x
    x = 314,808,360,459.18/641,870.64
  6. Step 6: Final answer
    x = 490,454.53

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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.