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Finding the Fourth Proportional to 12,879,807.74, 17,774,560.79 and 7,078,795.10

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Solution

The fourth proportional to 12,879,807.74, 17,774,560.79 and 7,078,795.10 is: 9,768,971.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879,807.74 : 17,774,560.79 = 7,078,795.10 : x
  2. Step 2: Convert to fraction form
    12,879,807.74/17,774,560.79 = 7,078,795.10/x
  3. Step 3: Cross multiply
    12,879,807.74x = 17,774,560.79 × 7,078,795.10
  4. Step 4: Simplify right side
    12,879,807.74x = 125,822,473,700,637.34
  5. Step 5: Solve for x
    x = 125,822,473,700,637.34/12,879,807.74
  6. Step 6: Final answer
    x = 9,768,971.42

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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.