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Finding the Fourth Proportional to 718.40, 991.32 and 456.32

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Solution

The fourth proportional to 718.40, 991.32 and 456.32 is: 629.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.40 : 991.32 = 456.32 : x
  2. Step 2: Convert to fraction form
    718.40/991.32 = 456.32/x
  3. Step 3: Cross multiply
    718.40x = 991.32 × 456.32
  4. Step 4: Simplify right side
    718.40x = 452,354.19
  5. Step 5: Solve for x
    x = 452,354.19/718.40
  6. Step 6: Final answer
    x = 629.67

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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.