Home / 15,386.09-21,228.89-9,415.58

Finding the Fourth Proportional to 15,386.09, 21,228.89 and 9,415.58

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Solution

The fourth proportional to 15,386.09, 21,228.89 and 9,415.58 is: 12,991.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,386.09 : 21,228.89 = 9,415.58 : x
  2. Step 2: Convert to fraction form
    15,386.09/21,228.89 = 9,415.58/x
  3. Step 3: Cross multiply
    15,386.09x = 21,228.89 × 9,415.58
  4. Step 4: Simplify right side
    15,386.09x = 199,882,158.88
  5. Step 5: Solve for x
    x = 199,882,158.88/15,386.09
  6. Step 6: Final answer
    x = 12,991.10

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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.