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Finding the Fourth Proportional to 639.25, 881.35 and 473.18

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Solution

The fourth proportional to 639.25, 881.35 and 473.18 is: 652.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.25 : 881.35 = 473.18 : x
  2. Step 2: Convert to fraction form
    639.25/881.35 = 473.18/x
  3. Step 3: Cross multiply
    639.25x = 881.35 × 473.18
  4. Step 4: Simplify right side
    639.25x = 417,037.19
  5. Step 5: Solve for x
    x = 417,037.19/639.25
  6. Step 6: Final answer
    x = 652.39

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Double scale
Find fourth proportional to 640.25, 882.73 and 474.18
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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.