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Finding the Fourth Proportional to 978.04, 1,349.66 and 579.52

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Solution

The fourth proportional to 978.04, 1,349.66 and 579.52 is: 799.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.04 : 1,349.66 = 579.52 : x
  2. Step 2: Convert to fraction form
    978.04/1,349.66 = 579.52/x
  3. Step 3: Cross multiply
    978.04x = 1,349.66 × 579.52
  4. Step 4: Simplify right side
    978.04x = 782,158.10
  5. Step 5: Solve for x
    x = 782,158.10/978.04
  6. Step 6: Final answer
    x = 799.72

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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.