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Finding the Fourth Proportional to 1,187.95, 1,777.56 and 841.63

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Solution

The fourth proportional to 1,187.95, 1,777.56 and 841.63 is: 1,259.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.95 : 1,777.56 = 841.63 : x
  2. Step 2: Convert to fraction form
    1,187.95/1,777.56 = 841.63/x
  3. Step 3: Cross multiply
    1,187.95x = 1,777.56 × 841.63
  4. Step 4: Simplify right side
    1,187.95x = 1,496,047.82
  5. Step 5: Solve for x
    x = 1,496,047.82/1,187.95
  6. Step 6: Final answer
    x = 1,259.35

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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.