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Finding the Fourth Proportional to 670.20, 924.64 and 390.52

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Solution

The fourth proportional to 670.20, 924.64 and 390.52 is: 538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.20 : 924.64 = 390.52 : x
  2. Step 2: Convert to fraction form
    670.20/924.64 = 390.52/x
  3. Step 3: Cross multiply
    670.20x = 924.64 × 390.52
  4. Step 4: Simplify right side
    670.20x = 361,090.41
  5. Step 5: Solve for x
    x = 361,090.41/670.20
  6. Step 6: Final answer
    x = 538.78

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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.