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Finding the Fourth Proportional to 1,162.15, 1,603.74 and 638.17

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Solution

The fourth proportional to 1,162.15, 1,603.74 and 638.17 is: 880.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.15 : 1,603.74 = 638.17 : x
  2. Step 2: Convert to fraction form
    1,162.15/1,603.74 = 638.17/x
  3. Step 3: Cross multiply
    1,162.15x = 1,603.74 × 638.17
  4. Step 4: Simplify right side
    1,162.15x = 1,023,454.75
  5. Step 5: Solve for x
    x = 1,023,454.75/1,162.15
  6. Step 6: Final answer
    x = 880.66

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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.