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Finding the Fourth Proportional to 718.45, 991.61 and 466.72

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Solution

The fourth proportional to 718.45, 991.61 and 466.72 is: 644.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.45 : 991.61 = 466.72 : x
  2. Step 2: Convert to fraction form
    718.45/991.61 = 466.72/x
  3. Step 3: Cross multiply
    718.45x = 991.61 × 466.72
  4. Step 4: Simplify right side
    718.45x = 462,804.22
  5. Step 5: Solve for x
    x = 462,804.22/718.45
  6. Step 6: Final answer
    x = 644.17

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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.