Home / 12,931.20-17,820.48-9,782.40

Finding the Fourth Proportional to 12,931.20, 17,820.48 and 9,782.40

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Solution

The fourth proportional to 12,931.20, 17,820.48 and 9,782.40 is: 13,481.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931.20 : 17,820.48 = 9,782.40 : x
  2. Step 2: Convert to fraction form
    12,931.20/17,820.48 = 9,782.40/x
  3. Step 3: Cross multiply
    12,931.20x = 17,820.48 × 9,782.40
  4. Step 4: Simplify right side
    12,931.20x = 174,327,063.55
  5. Step 5: Solve for x
    x = 174,327,063.55/12,931.20
  6. Step 6: Final answer
    x = 13,481.12

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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.