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Finding the Fourth Proportional to 621.90, 931.50 and 448.02

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Solution

The fourth proportional to 621.90, 931.50 and 448.02 is: 671.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 931.50 = 448.02 : x
  2. Step 2: Convert to fraction form
    621.90/931.50 = 448.02/x
  3. Step 3: Cross multiply
    621.90x = 931.50 × 448.02
  4. Step 4: Simplify right side
    621.90x = 417,330.63
  5. Step 5: Solve for x
    x = 417,330.63/621.90
  6. Step 6: Final answer
    x = 671.06

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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.