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Finding the Fourth Proportional to 670.69, 925.39 and 390.93

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Solution

The fourth proportional to 670.69, 925.39 and 390.93 is: 539.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.69 : 925.39 = 390.93 : x
  2. Step 2: Convert to fraction form
    670.69/925.39 = 390.93/x
  3. Step 3: Cross multiply
    670.69x = 925.39 × 390.93
  4. Step 4: Simplify right side
    670.69x = 361,761.74
  5. Step 5: Solve for x
    x = 361,761.74/670.69
  6. Step 6: Final answer
    x = 539.39

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1.5x scale

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.