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Finding the Fourth Proportional to 978.75, 1,468.44 and 613.08

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Solution

The fourth proportional to 978.75, 1,468.44 and 613.08 is: 919.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.75 : 1,468.44 = 613.08 : x
  2. Step 2: Convert to fraction form
    978.75/1,468.44 = 613.08/x
  3. Step 3: Cross multiply
    978.75x = 1,468.44 × 613.08
  4. Step 4: Simplify right side
    978.75x = 900,271.20
  5. Step 5: Solve for x
    x = 900,271.20/978.75
  6. Step 6: Final answer
    x = 919.82

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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.