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Finding the Fourth Proportional to 653.17, 979.98 and 556.40

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Solution

The fourth proportional to 653.17, 979.98 and 556.40 is: 834.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.17 : 979.98 = 556.40 : x
  2. Step 2: Convert to fraction form
    653.17/979.98 = 556.40/x
  3. Step 3: Cross multiply
    653.17x = 979.98 × 556.40
  4. Step 4: Simplify right side
    653.17x = 545,261.24
  5. Step 5: Solve for x
    x = 545,261.24/653.17
  6. Step 6: Final answer
    x = 834.80

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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.