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Finding the Fourth Proportional to 21,070.51, 31,606.98 and 7,922.99

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Solution

The fourth proportional to 21,070.51, 31,606.98 and 7,922.99 is: 11,884.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,070.51 : 31,606.98 = 7,922.99 : x
  2. Step 2: Convert to fraction form
    21,070.51/31,606.98 = 7,922.99/x
  3. Step 3: Cross multiply
    21,070.51x = 31,606.98 × 7,922.99
  4. Step 4: Simplify right side
    21,070.51x = 250,421,746.86
  5. Step 5: Solve for x
    x = 250,421,746.86/21,070.51
  6. Step 6: Final answer
    x = 11,884.94

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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.