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Finding the Fourth Proportional to 1,607.49, 2,217.48 and 978.21

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Solution

The fourth proportional to 1,607.49, 2,217.48 and 978.21 is: 1,349.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,607.49 : 2,217.48 = 978.21 : x
  2. Step 2: Convert to fraction form
    1,607.49/2,217.48 = 978.21/x
  3. Step 3: Cross multiply
    1,607.49x = 2,217.48 × 978.21
  4. Step 4: Simplify right side
    1,607.49x = 2,169,161.11
  5. Step 5: Solve for x
    x = 2,169,161.11/1,607.49
  6. Step 6: Final answer
    x = 1,349.41

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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.