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Finding the Fourth Proportional to 670.44, 924.87 and 390.63

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Solution

The fourth proportional to 670.44, 924.87 and 390.63 is: 538.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.44 : 924.87 = 390.63 : x
  2. Step 2: Convert to fraction form
    670.44/924.87 = 390.63/x
  3. Step 3: Cross multiply
    670.44x = 924.87 × 390.63
  4. Step 4: Simplify right side
    670.44x = 361,281.97
  5. Step 5: Solve for x
    x = 361,281.97/670.44
  6. Step 6: Final answer
    x = 538.87

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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.