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Finding the Fourth Proportional to 713,986.12, 985,308.33 and 391,687.93

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Solution

The fourth proportional to 713,986.12, 985,308.33 and 391,687.93 is: 540,533.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,986.12 : 985,308.33 = 391,687.93 : x
  2. Step 2: Convert to fraction form
    713,986.12/985,308.33 = 391,687.93/x
  3. Step 3: Cross multiply
    713,986.12x = 985,308.33 × 391,687.93
  4. Step 4: Simplify right side
    713,986.12x = 385,933,380,189.46
  5. Step 5: Solve for x
    x = 385,933,380,189.46/713,986.12
  6. Step 6: Final answer
    x = 540,533.45

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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.