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Finding the Fourth Proportional to 670.83, 925.58 and 390.89

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Solution

The fourth proportional to 670.83, 925.58 and 390.89 is: 539.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.83 : 925.58 = 390.89 : x
  2. Step 2: Convert to fraction form
    670.83/925.58 = 390.89/x
  3. Step 3: Cross multiply
    670.83x = 925.58 × 390.89
  4. Step 4: Simplify right side
    670.83x = 361,803.26
  5. Step 5: Solve for x
    x = 361,803.26/670.83
  6. Step 6: Final answer
    x = 539.34

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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.