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Finding the Fourth Proportional to 709,678.12, 979,347.16 and 403,753.72

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Solution

The fourth proportional to 709,678.12, 979,347.16 and 403,753.72 is: 557,175.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,678.12 : 979,347.16 = 403,753.72 : x
  2. Step 2: Convert to fraction form
    709,678.12/979,347.16 = 403,753.72/x
  3. Step 3: Cross multiply
    709,678.12x = 979,347.16 × 403,753.72
  4. Step 4: Simplify right side
    709,678.12x = 395,415,059,021.44
  5. Step 5: Solve for x
    x = 395,415,059,021.44/709,678.12
  6. Step 6: Final answer
    x = 557,175.21

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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.