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Finding the Fourth Proportional to 900.75, 1,243.04 and 486.75

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Solution

The fourth proportional to 900.75, 1,243.04 and 486.75 is: 671.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.75 : 1,243.04 = 486.75 : x
  2. Step 2: Convert to fraction form
    900.75/1,243.04 = 486.75/x
  3. Step 3: Cross multiply
    900.75x = 1,243.04 × 486.75
  4. Step 4: Simplify right side
    900.75x = 605,047.29
  5. Step 5: Solve for x
    x = 605,047.29/900.75
  6. Step 6: Final answer
    x = 671.72

Related Problems

Find fourth proportional to 450.38, 621.52 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.