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Finding the Fourth Proportional to 978.36, 1,350.60 and 585.72

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Solution

The fourth proportional to 978.36, 1,350.60 and 585.72 is: 808.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.36 : 1,350.60 = 585.72 : x
  2. Step 2: Convert to fraction form
    978.36/1,350.60 = 585.72/x
  3. Step 3: Cross multiply
    978.36x = 1,350.60 × 585.72
  4. Step 4: Simplify right side
    978.36x = 791,073.43
  5. Step 5: Solve for x
    x = 791,073.43/978.36
  6. Step 6: Final answer
    x = 808.57

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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.