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Finding the Fourth Proportional to 28,339.20, 42,508.80 and 14,515.20

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Solution

The fourth proportional to 28,339.20, 42,508.80 and 14,515.20 is: 21,772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,339.20 : 42,508.80 = 14,515.20 : x
  2. Step 2: Convert to fraction form
    28,339.20/42,508.80 = 14,515.20/x
  3. Step 3: Cross multiply
    28,339.20x = 42,508.80 × 14,515.20
  4. Step 4: Simplify right side
    28,339.20x = 617,023,733.76
  5. Step 5: Solve for x
    x = 617,023,733.76/28,339.20
  6. Step 6: Final answer
    x = 21,772.80

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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.