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Finding the Fourth Proportional to 670.14, 924.84 and 390.46

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Solution

The fourth proportional to 670.14, 924.84 and 390.46 is: 538.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.14 : 924.84 = 390.46 : x
  2. Step 2: Convert to fraction form
    670.14/924.84 = 390.46/x
  3. Step 3: Cross multiply
    670.14x = 924.84 × 390.46
  4. Step 4: Simplify right side
    670.14x = 361,113.03
  5. Step 5: Solve for x
    x = 361,113.03/670.14
  6. Step 6: Final answer
    x = 538.86

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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.