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Finding the Fourth Proportional to 1,070.84, 1,479.66 and 839.72

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Solution

The fourth proportional to 1,070.84, 1,479.66 and 839.72 is: 1,160.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.84 : 1,479.66 = 839.72 : x
  2. Step 2: Convert to fraction form
    1,070.84/1,479.66 = 839.72/x
  3. Step 3: Cross multiply
    1,070.84x = 1,479.66 × 839.72
  4. Step 4: Simplify right side
    1,070.84x = 1,242,500.10
  5. Step 5: Solve for x
    x = 1,242,500.10/1,070.84
  6. Step 6: Final answer
    x = 1,160.30

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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.