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Finding the Fourth Proportional to 979.76, 1,469.36 and 402.50

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Solution

The fourth proportional to 979.76, 1,469.36 and 402.50 is: 603.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.76 : 1,469.36 = 402.50 : x
  2. Step 2: Convert to fraction form
    979.76/1,469.36 = 402.50/x
  3. Step 3: Cross multiply
    979.76x = 1,469.36 × 402.50
  4. Step 4: Simplify right side
    979.76x = 591,417.40
  5. Step 5: Solve for x
    x = 591,417.40/979.76
  6. Step 6: Final answer
    x = 603.63

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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.