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Finding the Fourth Proportional to 978.01, 1,349.61 and 535.84

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Solution

The fourth proportional to 978.01, 1,349.61 and 535.84 is: 739.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.01 : 1,349.61 = 535.84 : x
  2. Step 2: Convert to fraction form
    978.01/1,349.61 = 535.84/x
  3. Step 3: Cross multiply
    978.01x = 1,349.61 × 535.84
  4. Step 4: Simplify right side
    978.01x = 723,175.02
  5. Step 5: Solve for x
    x = 723,175.02/978.01
  6. Step 6: Final answer
    x = 739.44

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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.