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Finding the Fourth Proportional to 643,705.08, 888,313.50 and 357,225.36

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Solution

The fourth proportional to 643,705.08, 888,313.50 and 357,225.36 is: 492,971.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,705.08 : 888,313.50 = 357,225.36 : x
  2. Step 2: Convert to fraction form
    643,705.08/888,313.50 = 357,225.36/x
  3. Step 3: Cross multiply
    643,705.08x = 888,313.50 × 357,225.36
  4. Step 4: Simplify right side
    643,705.08x = 317,328,109,830.36
  5. Step 5: Solve for x
    x = 317,328,109,830.36/643,705.08
  6. Step 6: Final answer
    x = 492,971.27

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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.