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Finding the Fourth Proportional to 454.32, 681.80 and 420.53

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Solution

The fourth proportional to 454.32, 681.80 and 420.53 is: 631.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.32 : 681.80 = 420.53 : x
  2. Step 2: Convert to fraction form
    454.32/681.80 = 420.53/x
  3. Step 3: Cross multiply
    454.32x = 681.80 × 420.53
  4. Step 4: Simplify right side
    454.32x = 286,711.84
  5. Step 5: Solve for x
    x = 286,711.84/454.32
  6. Step 6: Final answer
    x = 631.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.