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Finding the Fourth Proportional to 978.19, 1,467 and 430.25

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Solution

The fourth proportional to 978.19, 1,467 and 430.25 is: 645.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.19 : 1,467 = 430.25 : x
  2. Step 2: Convert to fraction form
    978.19/1,467 = 430.25/x
  3. Step 3: Cross multiply
    978.19x = 1,467 × 430.25
  4. Step 4: Simplify right side
    978.19x = 631,176.75
  5. Step 5: Solve for x
    x = 631,176.75/978.19
  6. Step 6: Final answer
    x = 645.25

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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.