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Finding the Fourth Proportional to 1,081.02, 1,490.64 and 707.88

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Solution

The fourth proportional to 1,081.02, 1,490.64 and 707.88 is: 976.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.02 : 1,490.64 = 707.88 : x
  2. Step 2: Convert to fraction form
    1,081.02/1,490.64 = 707.88/x
  3. Step 3: Cross multiply
    1,081.02x = 1,490.64 × 707.88
  4. Step 4: Simplify right side
    1,081.02x = 1,055,194.24
  5. Step 5: Solve for x
    x = 1,055,194.24/1,081.02
  6. Step 6: Final answer
    x = 976.11

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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.