Home / 12,445.20-18,667.80-9,140.40

Finding the Fourth Proportional to 12,445.20, 18,667.80 and 9,140.40

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Solution

The fourth proportional to 12,445.20, 18,667.80 and 9,140.40 is: 13,710.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,445.20 : 18,667.80 = 9,140.40 : x
  2. Step 2: Convert to fraction form
    12,445.20/18,667.80 = 9,140.40/x
  3. Step 3: Cross multiply
    12,445.20x = 18,667.80 × 9,140.40
  4. Step 4: Simplify right side
    12,445.20x = 170,631,159.12
  5. Step 5: Solve for x
    x = 170,631,159.12/12,445.20
  6. Step 6: Final answer
    x = 13,710.60

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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.