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Finding the Fourth Proportional to 713.40, 1,070.08 and 591.40

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Solution

The fourth proportional to 713.40, 1,070.08 and 591.40 is: 887.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.40 : 1,070.08 = 591.40 : x
  2. Step 2: Convert to fraction form
    713.40/1,070.08 = 591.40/x
  3. Step 3: Cross multiply
    713.40x = 1,070.08 × 591.40
  4. Step 4: Simplify right side
    713.40x = 632,847.39
  5. Step 5: Solve for x
    x = 632,847.39/713.40
  6. Step 6: Final answer
    x = 887.09

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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.