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Finding the Fourth Proportional to 720,507.45, 994,307.65 and 393,829.79

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Solution

The fourth proportional to 720,507.45, 994,307.65 and 393,829.79 is: 543,489.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,507.45 : 994,307.65 = 393,829.79 : x
  2. Step 2: Convert to fraction form
    720,507.45/994,307.65 = 393,829.79/x
  3. Step 3: Cross multiply
    720,507.45x = 994,307.65 × 393,829.79
  4. Step 4: Simplify right side
    720,507.45x = 391,587,972,994.89
  5. Step 5: Solve for x
    x = 391,587,972,994.89/720,507.45
  6. Step 6: Final answer
    x = 543,489.14

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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.