Home / 21,699.79-29,946.27-12,139.36

Finding the Fourth Proportional to 21,699.79, 29,946.27 and 12,139.36

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Solution

The fourth proportional to 21,699.79, 29,946.27 and 12,139.36 is: 16,752.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.79 : 29,946.27 = 12,139.36 : x
  2. Step 2: Convert to fraction form
    21,699.79/29,946.27 = 12,139.36/x
  3. Step 3: Cross multiply
    21,699.79x = 29,946.27 × 12,139.36
  4. Step 4: Simplify right side
    21,699.79x = 363,528,552.19
  5. Step 5: Solve for x
    x = 363,528,552.19/21,699.79
  6. Step 6: Final answer
    x = 16,752.63

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1.5x scale

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.