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Finding the Fourth Proportional to 983.72, 1,354.40 and 917.48

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Solution

The fourth proportional to 983.72, 1,354.40 and 917.48 is: 1,263.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.72 : 1,354.40 = 917.48 : x
  2. Step 2: Convert to fraction form
    983.72/1,354.40 = 917.48/x
  3. Step 3: Cross multiply
    983.72x = 1,354.40 × 917.48
  4. Step 4: Simplify right side
    983.72x = 1,242,634.91
  5. Step 5: Solve for x
    x = 1,242,634.91/983.72
  6. Step 6: Final answer
    x = 1,263.20

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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.