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Finding the Fourth Proportional to 1,079.61, 1,490.61 and 859.08

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Solution

The fourth proportional to 1,079.61, 1,490.61 and 859.08 is: 1,186.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.61 : 1,490.61 = 859.08 : x
  2. Step 2: Convert to fraction form
    1,079.61/1,490.61 = 859.08/x
  3. Step 3: Cross multiply
    1,079.61x = 1,490.61 × 859.08
  4. Step 4: Simplify right side
    1,079.61x = 1,280,553.24
  5. Step 5: Solve for x
    x = 1,280,553.24/1,079.61
  6. Step 6: Final answer
    x = 1,186.13

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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.