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Finding the Fourth Proportional to 644.76, 889.65 and 470.34

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Solution

The fourth proportional to 644.76, 889.65 and 470.34 is: 648.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.76 : 889.65 = 470.34 : x
  2. Step 2: Convert to fraction form
    644.76/889.65 = 470.34/x
  3. Step 3: Cross multiply
    644.76x = 889.65 × 470.34
  4. Step 4: Simplify right side
    644.76x = 418,437.98
  5. Step 5: Solve for x
    x = 418,437.98/644.76
  6. Step 6: Final answer
    x = 648.98

Related Problems

Find fourth proportional to 322.38, 444.83 and 235.17
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Double scale
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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.