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Finding the Fourth Proportional to 644.76, 889.70 and 365.03

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Solution

The fourth proportional to 644.76, 889.70 and 365.03 is: 503.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.76 : 889.70 = 365.03 : x
  2. Step 2: Convert to fraction form
    644.76/889.70 = 365.03/x
  3. Step 3: Cross multiply
    644.76x = 889.70 × 365.03
  4. Step 4: Simplify right side
    644.76x = 324,760.92
  5. Step 5: Solve for x
    x = 324,760.92/644.76
  6. Step 6: Final answer
    x = 503.69

Related Problems

Find fourth proportional to 322.38, 444.85 and 182.51
Half scale
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Double scale
Find fourth proportional to 645.76, 891.07 and 366.03
Similar ratio
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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.