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Finding the Fourth Proportional to 1,617.15, 2,425.58 and 642.99

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Solution

The fourth proportional to 1,617.15, 2,425.58 and 642.99 is: 964.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.15 : 2,425.58 = 642.99 : x
  2. Step 2: Convert to fraction form
    1,617.15/2,425.58 = 642.99/x
  3. Step 3: Cross multiply
    1,617.15x = 2,425.58 × 642.99
  4. Step 4: Simplify right side
    1,617.15x = 1,559,620.47
  5. Step 5: Solve for x
    x = 1,559,620.47/1,617.15
  6. Step 6: Final answer
    x = 964.43

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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.