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Finding the Fourth Proportional to 1,085.84, 1,497.95 and 643.49

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Solution

The fourth proportional to 1,085.84, 1,497.95 and 643.49 is: 887.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.84 : 1,497.95 = 643.49 : x
  2. Step 2: Convert to fraction form
    1,085.84/1,497.95 = 643.49/x
  3. Step 3: Cross multiply
    1,085.84x = 1,497.95 × 643.49
  4. Step 4: Simplify right side
    1,085.84x = 963,908.36
  5. Step 5: Solve for x
    x = 963,908.36/1,085.84
  6. Step 6: Final answer
    x = 887.71

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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.