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Finding the Fourth Proportional to 1,118.36, 1,543.36 and 621.00

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Solution

The fourth proportional to 1,118.36, 1,543.36 and 621.00 is: 856.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.36 : 1,543.36 = 621.00 : x
  2. Step 2: Convert to fraction form
    1,118.36/1,543.36 = 621.00/x
  3. Step 3: Cross multiply
    1,118.36x = 1,543.36 × 621.00
  4. Step 4: Simplify right side
    1,118.36x = 958,427.90
  5. Step 5: Solve for x
    x = 958,427.90/1,118.36
  6. Step 6: Final answer
    x = 856.99

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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.