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Finding the Fourth Proportional to 5,319.84, 7,980.12 and 1,621.72

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Solution

The fourth proportional to 5,319.84, 7,980.12 and 1,621.72 is: 2,432.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.84 : 7,980.12 = 1,621.72 : x
  2. Step 2: Convert to fraction form
    5,319.84/7,980.12 = 1,621.72/x
  3. Step 3: Cross multiply
    5,319.84x = 7,980.12 × 1,621.72
  4. Step 4: Simplify right side
    5,319.84x = 12,941,520.21
  5. Step 5: Solve for x
    x = 12,941,520.21/5,319.84
  6. Step 6: Final answer
    x = 2,432.69

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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.