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Finding the Fourth Proportional to 709,023.53, 978,455.51 and 386,740.55

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Solution

The fourth proportional to 709,023.53, 978,455.51 and 386,740.55 is: 533,703.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,023.53 : 978,455.51 = 386,740.55 : x
  2. Step 2: Convert to fraction form
    709,023.53/978,455.51 = 386,740.55/x
  3. Step 3: Cross multiply
    709,023.53x = 978,455.51 × 386,740.55
  4. Step 4: Simplify right side
    709,023.53x = 378,408,422,087.93
  5. Step 5: Solve for x
    x = 378,408,422,087.93/709,023.53
  6. Step 6: Final answer
    x = 533,703.62

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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.