Home / 15,880.85-21,898.51-13,390.40

Finding the Fourth Proportional to 15,880.85, 21,898.51 and 13,390.40

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Solution

The fourth proportional to 15,880.85, 21,898.51 and 13,390.40 is: 18,464.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,880.85 : 21,898.51 = 13,390.40 : x
  2. Step 2: Convert to fraction form
    15,880.85/21,898.51 = 13,390.40/x
  3. Step 3: Cross multiply
    15,880.85x = 21,898.51 × 13,390.40
  4. Step 4: Simplify right side
    15,880.85x = 293,229,808.30
  5. Step 5: Solve for x
    x = 293,229,808.30/15,880.85
  6. Step 6: Final answer
    x = 18,464.36

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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.