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Finding the Fourth Proportional to 1,128.63, 1,688.44 and 976.20

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Solution

The fourth proportional to 1,128.63, 1,688.44 and 976.20 is: 1,460.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.63 : 1,688.44 = 976.20 : x
  2. Step 2: Convert to fraction form
    1,128.63/1,688.44 = 976.20/x
  3. Step 3: Cross multiply
    1,128.63x = 1,688.44 × 976.20
  4. Step 4: Simplify right side
    1,128.63x = 1,648,255.13
  5. Step 5: Solve for x
    x = 1,648,255.13/1,128.63
  6. Step 6: Final answer
    x = 1,460.40

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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.