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Finding the Fourth Proportional to 709,102.48, 978,579.88 and 386,818

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Solution

The fourth proportional to 709,102.48, 978,579.88 and 386,818 is: 533,818.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,102.48 : 978,579.88 = 386,818 : x
  2. Step 2: Convert to fraction form
    709,102.48/978,579.88 = 386,818/x
  3. Step 3: Cross multiply
    709,102.48x = 978,579.88 × 386,818
  4. Step 4: Simplify right side
    709,102.48x = 378,532,312,021.84
  5. Step 5: Solve for x
    x = 378,532,312,021.84/709,102.48
  6. Step 6: Final answer
    x = 533,818.91

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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.