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Finding the Fourth Proportional to 978.48, 1,465.88 and 484.31

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Solution

The fourth proportional to 978.48, 1,465.88 and 484.31 is: 725.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.48 : 1,465.88 = 484.31 : x
  2. Step 2: Convert to fraction form
    978.48/1,465.88 = 484.31/x
  3. Step 3: Cross multiply
    978.48x = 1,465.88 × 484.31
  4. Step 4: Simplify right side
    978.48x = 709,940.34
  5. Step 5: Solve for x
    x = 709,940.34/978.48
  6. Step 6: Final answer
    x = 725.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.