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Finding the Fourth Proportional to 612.40, 844.76 and 391.18

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Solution

The fourth proportional to 612.40, 844.76 and 391.18 is: 539.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.40 : 844.76 = 391.18 : x
  2. Step 2: Convert to fraction form
    612.40/844.76 = 391.18/x
  3. Step 3: Cross multiply
    612.40x = 844.76 × 391.18
  4. Step 4: Simplify right side
    612.40x = 330,453.22
  5. Step 5: Solve for x
    x = 330,453.22/612.40
  6. Step 6: Final answer
    x = 539.60

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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.