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Finding the Fourth Proportional to 1,085.48, 1,497.85 and 643.22

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Solution

The fourth proportional to 1,085.48, 1,497.85 and 643.22 is: 887.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.48 : 1,497.85 = 643.22 : x
  2. Step 2: Convert to fraction form
    1,085.48/1,497.85 = 643.22/x
  3. Step 3: Cross multiply
    1,085.48x = 1,497.85 × 643.22
  4. Step 4: Simplify right side
    1,085.48x = 963,447.08
  5. Step 5: Solve for x
    x = 963,447.08/1,085.48
  6. Step 6: Final answer
    x = 887.58

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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.