Home / 12,420.80-18,631.20-9,148.40

Finding the Fourth Proportional to 12,420.80, 18,631.20 and 9,148.40

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Solution

The fourth proportional to 12,420.80, 18,631.20 and 9,148.40 is: 13,722.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.80 : 18,631.20 = 9,148.40 : x
  2. Step 2: Convert to fraction form
    12,420.80/18,631.20 = 9,148.40/x
  3. Step 3: Cross multiply
    12,420.80x = 18,631.20 × 9,148.40
  4. Step 4: Simplify right side
    12,420.80x = 170,445,670.08
  5. Step 5: Solve for x
    x = 170,445,670.08/12,420.80
  6. Step 6: Final answer
    x = 13,722.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.