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Finding the Fourth Proportional to 712.36, 1,070.78 and 591.40

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Solution

The fourth proportional to 712.36, 1,070.78 and 591.40 is: 888.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.36 : 1,070.78 = 591.40 : x
  2. Step 2: Convert to fraction form
    712.36/1,070.78 = 591.40/x
  3. Step 3: Cross multiply
    712.36x = 1,070.78 × 591.40
  4. Step 4: Simplify right side
    712.36x = 633,259.29
  5. Step 5: Solve for x
    x = 633,259.29/712.36
  6. Step 6: Final answer
    x = 888.96

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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.