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Finding the Fourth Proportional to 978.08, 1,350.16 and 605.04

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Solution

The fourth proportional to 978.08, 1,350.16 and 605.04 is: 835.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.08 : 1,350.16 = 605.04 : x
  2. Step 2: Convert to fraction form
    978.08/1,350.16 = 605.04/x
  3. Step 3: Cross multiply
    978.08x = 1,350.16 × 605.04
  4. Step 4: Simplify right side
    978.08x = 816,900.81
  5. Step 5: Solve for x
    x = 816,900.81/978.08
  6. Step 6: Final answer
    x = 835.21

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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.