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Finding the Fourth Proportional to 12,578,695.74, 18,868,463.09 and 3,480,031.40

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Solution

The fourth proportional to 12,578,695.74, 18,868,463.09 and 3,480,031.40 is: 5,220,163.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,578,695.74 : 18,868,463.09 = 3,480,031.40 : x
  2. Step 2: Convert to fraction form
    12,578,695.74/18,868,463.09 = 3,480,031.40/x
  3. Step 3: Cross multiply
    12,578,695.74x = 18,868,463.09 × 3,480,031.40
  4. Step 4: Simplify right side
    12,578,695.74x = 65,662,844,030,383.77
  5. Step 5: Solve for x
    x = 65,662,844,030,383.77/12,578,695.74
  6. Step 6: Final answer
    x = 5,220,163.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.