Home / 15,890.16-21,915-15,014.64

Finding the Fourth Proportional to 15,890.16, 21,915 and 15,014.64

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Solution

The fourth proportional to 15,890.16, 21,915 and 15,014.64 is: 20,707.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,890.16 : 21,915 = 15,014.64 : x
  2. Step 2: Convert to fraction form
    15,890.16/21,915 = 15,014.64/x
  3. Step 3: Cross multiply
    15,890.16x = 21,915 × 15,014.64
  4. Step 4: Simplify right side
    15,890.16x = 329,045,835.60
  5. Step 5: Solve for x
    x = 329,045,835.60/15,890.16
  6. Step 6: Final answer
    x = 20,707.52

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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.