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Finding the Fourth Proportional to 978.55, 1,350.36 and 585.34

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Solution

The fourth proportional to 978.55, 1,350.36 and 585.34 is: 807.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.55 : 1,350.36 = 585.34 : x
  2. Step 2: Convert to fraction form
    978.55/1,350.36 = 585.34/x
  3. Step 3: Cross multiply
    978.55x = 1,350.36 × 585.34
  4. Step 4: Simplify right side
    978.55x = 790,410.04
  5. Step 5: Solve for x
    x = 790,410.04/978.55
  6. Step 6: Final answer
    x = 807.74

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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.