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Finding the Fourth Proportional to 653.80, 917.75 and 653.80

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Solution

The fourth proportional to 653.80, 917.75 and 653.80 is: 917.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.80 : 917.75 = 653.80 : x
  2. Step 2: Convert to fraction form
    653.80/917.75 = 653.80/x
  3. Step 3: Cross multiply
    653.80x = 917.75 × 653.80
  4. Step 4: Simplify right side
    653.80x = 600,024.95
  5. Step 5: Solve for x
    x = 600,024.95/653.80
  6. Step 6: Final answer
    x = 917.75

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.