Home / 21,006.40-31,509.60-17,312.80

Finding the Fourth Proportional to 21,006.40, 31,509.60 and 17,312.80

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Solution

The fourth proportional to 21,006.40, 31,509.60 and 17,312.80 is: 25,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.40 : 31,509.60 = 17,312.80 : x
  2. Step 2: Convert to fraction form
    21,006.40/31,509.60 = 17,312.80/x
  3. Step 3: Cross multiply
    21,006.40x = 31,509.60 × 17,312.80
  4. Step 4: Simplify right side
    21,006.40x = 545,519,402.88
  5. Step 5: Solve for x
    x = 545,519,402.88/21,006.40
  6. Step 6: Final answer
    x = 25,969.20

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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.