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Finding the Fourth Proportional to 900.77, 1,243.06 and 486.77

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Solution

The fourth proportional to 900.77, 1,243.06 and 486.77 is: 671.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.77 : 1,243.06 = 486.77 : x
  2. Step 2: Convert to fraction form
    900.77/1,243.06 = 486.77/x
  3. Step 3: Cross multiply
    900.77x = 1,243.06 × 486.77
  4. Step 4: Simplify right side
    900.77x = 605,076.88
  5. Step 5: Solve for x
    x = 605,076.88/900.77
  6. Step 6: Final answer
    x = 671.74

Related Problems

Find fourth proportional to 450.38, 621.53 and 243.38
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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.