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Finding the Fourth Proportional to 687.03, 947.82 and 424.59

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Solution

The fourth proportional to 687.03, 947.82 and 424.59 is: 585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.03 : 947.82 = 424.59 : x
  2. Step 2: Convert to fraction form
    687.03/947.82 = 424.59/x
  3. Step 3: Cross multiply
    687.03x = 947.82 × 424.59
  4. Step 4: Simplify right side
    687.03x = 402,434.89
  5. Step 5: Solve for x
    x = 402,434.89/687.03
  6. Step 6: Final answer
    x = 585.76

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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.