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Finding the Fourth Proportional to 1,353.79, 1,868.19 and 764.32

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Solution

The fourth proportional to 1,353.79, 1,868.19 and 764.32 is: 1,054.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.79 : 1,868.19 = 764.32 : x
  2. Step 2: Convert to fraction form
    1,353.79/1,868.19 = 764.32/x
  3. Step 3: Cross multiply
    1,353.79x = 1,868.19 × 764.32
  4. Step 4: Simplify right side
    1,353.79x = 1,427,894.98
  5. Step 5: Solve for x
    x = 1,427,894.98/1,353.79
  6. Step 6: Final answer
    x = 1,054.74

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Half scale
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Double scale
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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.