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Finding the Fourth Proportional to 553,556.13, 763,910.15 and 311,842.50

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Solution

The fourth proportional to 553,556.13, 763,910.15 and 311,842.50 is: 430,344.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,556.13 : 763,910.15 = 311,842.50 : x
  2. Step 2: Convert to fraction form
    553,556.13/763,910.15 = 311,842.50/x
  3. Step 3: Cross multiply
    553,556.13x = 763,910.15 × 311,842.50
  4. Step 4: Simplify right side
    553,556.13x = 238,219,649,392.16
  5. Step 5: Solve for x
    x = 238,219,649,392.16/553,556.13
  6. Step 6: Final answer
    x = 430,344.16

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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.