Home / 14,445.20-19,920.16-8,780.72

Finding the Fourth Proportional to 14,445.20, 19,920.16 and 8,780.72

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Solution

The fourth proportional to 14,445.20, 19,920.16 and 8,780.72 is: 12,108.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,445.20 : 19,920.16 = 8,780.72 : x
  2. Step 2: Convert to fraction form
    14,445.20/19,920.16 = 8,780.72/x
  3. Step 3: Cross multiply
    14,445.20x = 19,920.16 × 8,780.72
  4. Step 4: Simplify right side
    14,445.20x = 174,913,347.32
  5. Step 5: Solve for x
    x = 174,913,347.32/14,445.20
  6. Step 6: Final answer
    x = 12,108.75

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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.