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Finding the Fourth Proportional to 648.60, 973.39 and 520.15

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Solution

The fourth proportional to 648.60, 973.39 and 520.15 is: 780.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.60 : 973.39 = 520.15 : x
  2. Step 2: Convert to fraction form
    648.60/973.39 = 520.15/x
  3. Step 3: Cross multiply
    648.60x = 973.39 × 520.15
  4. Step 4: Simplify right side
    648.60x = 506,305.07
  5. Step 5: Solve for x
    x = 506,305.07/648.60
  6. Step 6: Final answer
    x = 780.62

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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.