Home / 21,835.60-30,138.72-12,407.20

Finding the Fourth Proportional to 21,835.60, 30,138.72 and 12,407.20

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Solution

The fourth proportional to 21,835.60, 30,138.72 and 12,407.20 is: 17,125.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,835.60 : 30,138.72 = 12,407.20 : x
  2. Step 2: Convert to fraction form
    21,835.60/30,138.72 = 12,407.20/x
  3. Step 3: Cross multiply
    21,835.60x = 30,138.72 × 12,407.20
  4. Step 4: Simplify right side
    21,835.60x = 373,937,126.78
  5. Step 5: Solve for x
    x = 373,937,126.78/21,835.60
  6. Step 6: Final answer
    x = 17,125.11

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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.