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Finding the Fourth Proportional to 653.47, 901.80 and 391.50

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Solution

The fourth proportional to 653.47, 901.80 and 391.50 is: 540.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.47 : 901.80 = 391.50 : x
  2. Step 2: Convert to fraction form
    653.47/901.80 = 391.50/x
  3. Step 3: Cross multiply
    653.47x = 901.80 × 391.50
  4. Step 4: Simplify right side
    653.47x = 353,054.70
  5. Step 5: Solve for x
    x = 353,054.70/653.47
  6. Step 6: Final answer
    x = 540.28

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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.