Home / 15,386.40-21,219.84-12,401.28

Finding the Fourth Proportional to 15,386.40, 21,219.84 and 12,401.28

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Solution

The fourth proportional to 15,386.40, 21,219.84 and 12,401.28 is: 17,102.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,386.40 : 21,219.84 = 12,401.28 : x
  2. Step 2: Convert to fraction form
    15,386.40/21,219.84 = 12,401.28/x
  3. Step 3: Cross multiply
    15,386.40x = 21,219.84 × 12,401.28
  4. Step 4: Simplify right side
    15,386.40x = 263,153,177.40
  5. Step 5: Solve for x
    x = 263,153,177.40/15,386.40
  6. Step 6: Final answer
    x = 17,102.97

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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.