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Finding the Fourth Proportional to 785.87, 1,085.28 and 647.36

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Solution

The fourth proportional to 785.87, 1,085.28 and 647.36 is: 894.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.87 : 1,085.28 = 647.36 : x
  2. Step 2: Convert to fraction form
    785.87/1,085.28 = 647.36/x
  3. Step 3: Cross multiply
    785.87x = 1,085.28 × 647.36
  4. Step 4: Simplify right side
    785.87x = 702,561.43
  5. Step 5: Solve for x
    x = 702,561.43/785.87
  6. Step 6: Final answer
    x = 894.00

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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.