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Finding the Fourth Proportional to 709,158.72, 978,563.56 and 399,055.89

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Solution

The fourth proportional to 709,158.72, 978,563.56 and 399,055.89 is: 550,654.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,158.72 : 978,563.56 = 399,055.89 : x
  2. Step 2: Convert to fraction form
    709,158.72/978,563.56 = 399,055.89/x
  3. Step 3: Cross multiply
    709,158.72x = 978,563.56 × 399,055.89
  4. Step 4: Simplify right side
    709,158.72x = 390,501,552,357.37
  5. Step 5: Solve for x
    x = 390,501,552,357.37/709,158.72
  6. Step 6: Final answer
    x = 550,654.66

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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.