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Finding the Fourth Proportional to 709,389.12, 978,959.50 and 387,106.32

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Solution

The fourth proportional to 709,389.12, 978,959.50 and 387,106.32 is: 534,208.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,389.12 : 978,959.50 = 387,106.32 : x
  2. Step 2: Convert to fraction form
    709,389.12/978,959.50 = 387,106.32/x
  3. Step 3: Cross multiply
    709,389.12x = 978,959.50 × 387,106.32
  4. Step 4: Simplify right side
    709,389.12x = 378,961,409,474.04
  5. Step 5: Solve for x
    x = 378,961,409,474.04/709,389.12
  6. Step 6: Final answer
    x = 534,208.09

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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.