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Finding the Fourth Proportional to 718,369.37, 991,357.47 and 391,679.69

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Solution

The fourth proportional to 718,369.37, 991,357.47 and 391,679.69 is: 540,522.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,369.37 : 991,357.47 = 391,679.69 : x
  2. Step 2: Convert to fraction form
    718,369.37/991,357.47 = 391,679.69/x
  3. Step 3: Cross multiply
    718,369.37x = 991,357.47 × 391,679.69
  4. Step 4: Simplify right side
    718,369.37x = 388,294,581,572.00
  5. Step 5: Solve for x
    x = 388,294,581,572.00/718,369.37
  6. Step 6: Final answer
    x = 540,522.19

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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.