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Finding the Fourth Proportional to 978.60, 1,466.01 and 653.25

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Solution

The fourth proportional to 978.60, 1,466.01 and 653.25 is: 978.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.60 : 1,466.01 = 653.25 : x
  2. Step 2: Convert to fraction form
    978.60/1,466.01 = 653.25/x
  3. Step 3: Cross multiply
    978.60x = 1,466.01 × 653.25
  4. Step 4: Simplify right side
    978.60x = 957,671.03
  5. Step 5: Solve for x
    x = 957,671.03/978.60
  6. Step 6: Final answer
    x = 978.61

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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.