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Finding the Fourth Proportional to 709,078.55, 978,526.77 and 386,788.62

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Solution

The fourth proportional to 709,078.55, 978,526.77 and 386,788.62 is: 533,767.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,078.55 : 978,526.77 = 386,788.62 : x
  2. Step 2: Convert to fraction form
    709,078.55/978,526.77 = 386,788.62/x
  3. Step 3: Cross multiply
    709,078.55x = 978,526.77 × 386,788.62
  4. Step 4: Simplify right side
    709,078.55x = 378,483,019,001.36
  5. Step 5: Solve for x
    x = 378,483,019,001.36/709,078.55
  6. Step 6: Final answer
    x = 533,767.41

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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.