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Finding the Fourth Proportional to 649.20, 973.80 and 325.20

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Solution

The fourth proportional to 649.20, 973.80 and 325.20 is: 487.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.20 : 973.80 = 325.20 : x
  2. Step 2: Convert to fraction form
    649.20/973.80 = 325.20/x
  3. Step 3: Cross multiply
    649.20x = 973.80 × 325.20
  4. Step 4: Simplify right side
    649.20x = 316,679.76
  5. Step 5: Solve for x
    x = 316,679.76/649.20
  6. Step 6: Final answer
    x = 487.80

Related Problems

Find fourth proportional to 324.60, 486.90 and 162.60
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.