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Finding the Fourth Proportional to 558.79, 770.69 and 521.53

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Solution

The fourth proportional to 558.79, 770.69 and 521.53 is: 719.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.79 : 770.69 = 521.53 : x
  2. Step 2: Convert to fraction form
    558.79/770.69 = 521.53/x
  3. Step 3: Cross multiply
    558.79x = 770.69 × 521.53
  4. Step 4: Simplify right side
    558.79x = 401,937.96
  5. Step 5: Solve for x
    x = 401,937.96/558.79
  6. Step 6: Final answer
    x = 719.30

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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.