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Finding the Fourth Proportional to 643.38, 888.27 and 477.39

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Solution

The fourth proportional to 643.38, 888.27 and 477.39 is: 659.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 888.27 = 477.39 : x
  2. Step 2: Convert to fraction form
    643.38/888.27 = 477.39/x
  3. Step 3: Cross multiply
    643.38x = 888.27 × 477.39
  4. Step 4: Simplify right side
    643.38x = 424,052.76
  5. Step 5: Solve for x
    x = 424,052.76/643.38
  6. Step 6: Final answer
    x = 659.11

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Double scale
Find fourth proportional to 644.38, 889.65 and 478.39
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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.