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Finding the Fourth Proportional to 926.45, 1,389.68 and 378.51

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Solution

The fourth proportional to 926.45, 1,389.68 and 378.51 is: 567.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.45 : 1,389.68 = 378.51 : x
  2. Step 2: Convert to fraction form
    926.45/1,389.68 = 378.51/x
  3. Step 3: Cross multiply
    926.45x = 1,389.68 × 378.51
  4. Step 4: Simplify right side
    926.45x = 526,005.88
  5. Step 5: Solve for x
    x = 526,005.88/926.45
  6. Step 6: Final answer
    x = 567.77

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.