Home / 21,102,979.20-31,654,468.80-12,480,950.40

Finding the Fourth Proportional to 21,102,979.20, 31,654,468.80 and 12,480,950.40

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Solution

The fourth proportional to 21,102,979.20, 31,654,468.80 and 12,480,950.40 is: 18,721,425.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,102,979.20 : 31,654,468.80 = 12,480,950.40 : x
  2. Step 2: Convert to fraction form
    21,102,979.20/31,654,468.80 = 12,480,950.40/x
  3. Step 3: Cross multiply
    21,102,979.20x = 31,654,468.80 × 12,480,950.40
  4. Step 4: Simplify right side
    21,102,979.20x = 395,077,855,031,147.56
  5. Step 5: Solve for x
    x = 395,077,855,031,147.56/21,102,979.20
  6. Step 6: Final answer
    x = 18,721,425.60

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1.5x scale

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.