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Finding the Fourth Proportional to 653.30, 981.55 and 491.30

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Solution

The fourth proportional to 653.30, 981.55 and 491.30 is: 738.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.30 : 981.55 = 491.30 : x
  2. Step 2: Convert to fraction form
    653.30/981.55 = 491.30/x
  3. Step 3: Cross multiply
    653.30x = 981.55 × 491.30
  4. Step 4: Simplify right side
    653.30x = 482,235.52
  5. Step 5: Solve for x
    x = 482,235.52/653.30
  6. Step 6: Final answer
    x = 738.15

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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.