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Finding the Fourth Proportional to 647.10, 890.67 and 553.53

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Solution

The fourth proportional to 647.10, 890.67 and 553.53 is: 761.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.10 : 890.67 = 553.53 : x
  2. Step 2: Convert to fraction form
    647.10/890.67 = 553.53/x
  3. Step 3: Cross multiply
    647.10x = 890.67 × 553.53
  4. Step 4: Simplify right side
    647.10x = 493,012.57
  5. Step 5: Solve for x
    x = 493,012.57/647.10
  6. Step 6: Final answer
    x = 761.88

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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.