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Finding the Fourth Proportional to 991,388, 1,368,119.08 and 538,679

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Solution

The fourth proportional to 991,388, 1,368,119.08 and 538,679 is: 743,379.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,388 : 1,368,119.08 = 538,679 : x
  2. Step 2: Convert to fraction form
    991,388/1,368,119.08 = 538,679/x
  3. Step 3: Cross multiply
    991,388x = 1,368,119.08 × 538,679
  4. Step 4: Simplify right side
    991,388x = 736,977,017,895.32
  5. Step 5: Solve for x
    x = 736,977,017,895.32/991,388
  6. Step 6: Final answer
    x = 743,379.00

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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.