Home / 15,720.66-21,699.14-9,351.77

Finding the Fourth Proportional to 15,720.66, 21,699.14 and 9,351.77

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Solution

The fourth proportional to 15,720.66, 21,699.14 and 9,351.77 is: 12,908.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.66 : 21,699.14 = 9,351.77 : x
  2. Step 2: Convert to fraction form
    15,720.66/21,699.14 = 9,351.77/x
  3. Step 3: Cross multiply
    15,720.66x = 21,699.14 × 9,351.77
  4. Step 4: Simplify right side
    15,720.66x = 202,925,211.22
  5. Step 5: Solve for x
    x = 202,925,211.22/15,720.66
  6. Step 6: Final answer
    x = 12,908.19

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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.