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Finding the Fourth Proportional to 1,390.54, 1,918.70 and 801.12

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Solution

The fourth proportional to 1,390.54, 1,918.70 and 801.12 is: 1,105.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.54 : 1,918.70 = 801.12 : x
  2. Step 2: Convert to fraction form
    1,390.54/1,918.70 = 801.12/x
  3. Step 3: Cross multiply
    1,390.54x = 1,918.70 × 801.12
  4. Step 4: Simplify right side
    1,390.54x = 1,537,108.94
  5. Step 5: Solve for x
    x = 1,537,108.94/1,390.54
  6. Step 6: Final answer
    x = 1,105.40

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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.