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Finding the Fourth Proportional to 1,187.48, 1,638.06 and 921.80

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Solution

The fourth proportional to 1,187.48, 1,638.06 and 921.80 is: 1,271.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.48 : 1,638.06 = 921.80 : x
  2. Step 2: Convert to fraction form
    1,187.48/1,638.06 = 921.80/x
  3. Step 3: Cross multiply
    1,187.48x = 1,638.06 × 921.80
  4. Step 4: Simplify right side
    1,187.48x = 1,509,963.71
  5. Step 5: Solve for x
    x = 1,509,963.71/1,187.48
  6. Step 6: Final answer
    x = 1,271.57

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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.