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Finding the Fourth Proportional to 1,079.79, 1,490.10 and 707.38

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Solution

The fourth proportional to 1,079.79, 1,490.10 and 707.38 is: 976.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.79 : 1,490.10 = 707.38 : x
  2. Step 2: Convert to fraction form
    1,079.79/1,490.10 = 707.38/x
  3. Step 3: Cross multiply
    1,079.79x = 1,490.10 × 707.38
  4. Step 4: Simplify right side
    1,079.79x = 1,054,066.94
  5. Step 5: Solve for x
    x = 1,054,066.94/1,079.79
  6. Step 6: Final answer
    x = 976.18

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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.