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Finding the Fourth Proportional to 653.96, 901.78 and 487.91

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Solution

The fourth proportional to 653.96, 901.78 and 487.91 is: 672.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.96 : 901.78 = 487.91 : x
  2. Step 2: Convert to fraction form
    653.96/901.78 = 487.91/x
  3. Step 3: Cross multiply
    653.96x = 901.78 × 487.91
  4. Step 4: Simplify right side
    653.96x = 439,981.75
  5. Step 5: Solve for x
    x = 439,981.75/653.96
  6. Step 6: Final answer
    x = 672.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.