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Finding the Fourth Proportional to 1,399.88, 1,931.75 and 840.38

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Solution

The fourth proportional to 1,399.88, 1,931.75 and 840.38 is: 1,159.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.88 : 1,931.75 = 840.38 : x
  2. Step 2: Convert to fraction form
    1,399.88/1,931.75 = 840.38/x
  3. Step 3: Cross multiply
    1,399.88x = 1,931.75 × 840.38
  4. Step 4: Simplify right side
    1,399.88x = 1,623,393.36
  5. Step 5: Solve for x
    x = 1,623,393.36/1,399.88
  6. Step 6: Final answer
    x = 1,159.66

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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.