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Finding the Fourth Proportional to 648.90, 972.65 and 374.42

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Solution

The fourth proportional to 648.90, 972.65 and 374.42 is: 561.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.90 : 972.65 = 374.42 : x
  2. Step 2: Convert to fraction form
    648.90/972.65 = 374.42/x
  3. Step 3: Cross multiply
    648.90x = 972.65 × 374.42
  4. Step 4: Simplify right side
    648.90x = 364,172.88
  5. Step 5: Solve for x
    x = 364,172.88/648.90
  6. Step 6: Final answer
    x = 561.22

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1.5x scale

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.