Home / 13,547.20-20,320.80-12,078.40

Finding the Fourth Proportional to 13,547.20, 20,320.80 and 12,078.40

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Solution

The fourth proportional to 13,547.20, 20,320.80 and 12,078.40 is: 18,117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,547.20 : 20,320.80 = 12,078.40 : x
  2. Step 2: Convert to fraction form
    13,547.20/20,320.80 = 12,078.40/x
  3. Step 3: Cross multiply
    13,547.20x = 20,320.80 × 12,078.40
  4. Step 4: Simplify right side
    13,547.20x = 245,442,750.72
  5. Step 5: Solve for x
    x = 245,442,750.72/13,547.20
  6. Step 6: Final answer
    x = 18,117.60

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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.