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Finding the Fourth Proportional to 1,639.40, 2,458.20 and 543.20

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Solution

The fourth proportional to 1,639.40, 2,458.20 and 543.20 is: 814.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.40 : 2,458.20 = 543.20 : x
  2. Step 2: Convert to fraction form
    1,639.40/2,458.20 = 543.20/x
  3. Step 3: Cross multiply
    1,639.40x = 2,458.20 × 543.20
  4. Step 4: Simplify right side
    1,639.40x = 1,335,294.24
  5. Step 5: Solve for x
    x = 1,335,294.24/1,639.40
  6. Step 6: Final answer
    x = 814.50

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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.