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Finding the Fourth Proportional to 718,483.06, 991,499.30 and 391,795.28

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Solution

The fourth proportional to 718,483.06, 991,499.30 and 391,795.28 is: 540,673.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,483.06 : 991,499.30 = 391,795.28 : x
  2. Step 2: Convert to fraction form
    718,483.06/991,499.30 = 391,795.28/x
  3. Step 3: Cross multiply
    718,483.06x = 991,499.30 × 391,795.28
  4. Step 4: Simplify right side
    718,483.06x = 388,464,740,905.81
  5. Step 5: Solve for x
    x = 388,464,740,905.81/718,483.06
  6. Step 6: Final answer
    x = 540,673.49

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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.