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Finding the Fourth Proportional to 786.08, 1,084.92 and 491.36

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Solution

The fourth proportional to 786.08, 1,084.92 and 491.36 is: 678.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.08 : 1,084.92 = 491.36 : x
  2. Step 2: Convert to fraction form
    786.08/1,084.92 = 491.36/x
  3. Step 3: Cross multiply
    786.08x = 1,084.92 × 491.36
  4. Step 4: Simplify right side
    786.08x = 533,086.29
  5. Step 5: Solve for x
    x = 533,086.29/786.08
  6. Step 6: Final answer
    x = 678.16

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1.5x scale

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.