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Finding the Fourth Proportional to 978.01, 1,349.62 and 558.38

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Solution

The fourth proportional to 978.01, 1,349.62 and 558.38 is: 770.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.01 : 1,349.62 = 558.38 : x
  2. Step 2: Convert to fraction form
    978.01/1,349.62 = 558.38/x
  3. Step 3: Cross multiply
    978.01x = 1,349.62 × 558.38
  4. Step 4: Simplify right side
    978.01x = 753,602.79
  5. Step 5: Solve for x
    x = 753,602.79/978.01
  6. Step 6: Final answer
    x = 770.55

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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.