Home / 21,355.76-31,903.48-20,578.16

Finding the Fourth Proportional to 21,355.76, 31,903.48 and 20,578.16

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Solution

The fourth proportional to 21,355.76, 31,903.48 and 20,578.16 is: 30,741.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,355.76 : 31,903.48 = 20,578.16 : x
  2. Step 2: Convert to fraction form
    21,355.76/31,903.48 = 20,578.16/x
  3. Step 3: Cross multiply
    21,355.76x = 31,903.48 × 20,578.16
  4. Step 4: Simplify right side
    21,355.76x = 656,514,916.00
  5. Step 5: Solve for x
    x = 656,514,916.00/21,355.76
  6. Step 6: Final answer
    x = 30,741.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.