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Finding the Fourth Proportional to 900.74, 1,243.02 and 486.74

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Solution

The fourth proportional to 900.74, 1,243.02 and 486.74 is: 671.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.74 : 1,243.02 = 486.74 : x
  2. Step 2: Convert to fraction form
    900.74/1,243.02 = 486.74/x
  3. Step 3: Cross multiply
    900.74x = 1,243.02 × 486.74
  4. Step 4: Simplify right side
    900.74x = 605,026.00
  5. Step 5: Solve for x
    x = 605,026.00/900.74
  6. Step 6: Final answer
    x = 671.70

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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.