Home / 21,070.16-31,638.12-20,135.36

Finding the Fourth Proportional to 21,070.16, 31,638.12 and 20,135.36

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Solution

The fourth proportional to 21,070.16, 31,638.12 and 20,135.36 is: 30,234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,070.16 : 31,638.12 = 20,135.36 : x
  2. Step 2: Convert to fraction form
    21,070.16/31,638.12 = 20,135.36/x
  3. Step 3: Cross multiply
    21,070.16x = 31,638.12 × 20,135.36
  4. Step 4: Simplify right side
    21,070.16x = 637,044,935.92
  5. Step 5: Solve for x
    x = 637,044,935.92/21,070.16
  6. Step 6: Final answer
    x = 30,234.46

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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.