Home / 21,010.32-31,515.08-5,215.39

Finding the Fourth Proportional to 21,010.32, 31,515.08 and 5,215.39

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Solution

The fourth proportional to 21,010.32, 31,515.08 and 5,215.39 is: 7,822.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.32 : 31,515.08 = 5,215.39 : x
  2. Step 2: Convert to fraction form
    21,010.32/31,515.08 = 5,215.39/x
  3. Step 3: Cross multiply
    21,010.32x = 31,515.08 × 5,215.39
  4. Step 4: Simplify right side
    21,010.32x = 164,363,328.22
  5. Step 5: Solve for x
    x = 164,363,328.22/21,010.32
  6. Step 6: Final answer
    x = 7,822.98

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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.