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Finding the Fourth Proportional to 713.76, 1,070.80 and 389.04

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Solution

The fourth proportional to 713.76, 1,070.80 and 389.04 is: 583.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.76 : 1,070.80 = 389.04 : x
  2. Step 2: Convert to fraction form
    713.76/1,070.80 = 389.04/x
  3. Step 3: Cross multiply
    713.76x = 1,070.80 × 389.04
  4. Step 4: Simplify right side
    713.76x = 416,584.03
  5. Step 5: Solve for x
    x = 416,584.03/713.76
  6. Step 6: Final answer
    x = 583.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.