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Finding the Fourth Proportional to 641,875.36, 885,815.64 and 355,395.40

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Solution

The fourth proportional to 641,875.36, 885,815.64 and 355,395.40 is: 490,460.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,875.36 : 885,815.64 = 355,395.40 : x
  2. Step 2: Convert to fraction form
    641,875.36/885,815.64 = 355,395.40/x
  3. Step 3: Cross multiply
    641,875.36x = 885,815.64 × 355,395.40
  4. Step 4: Simplify right side
    641,875.36x = 314,814,803,704.06
  5. Step 5: Solve for x
    x = 314,814,803,704.06/641,875.36
  6. Step 6: Final answer
    x = 490,460.96

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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.