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Finding the Fourth Proportional to 719.09, 1,078.40 and 476.90

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Solution

The fourth proportional to 719.09, 1,078.40 and 476.90 is: 715.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.09 : 1,078.40 = 476.90 : x
  2. Step 2: Convert to fraction form
    719.09/1,078.40 = 476.90/x
  3. Step 3: Cross multiply
    719.09x = 1,078.40 × 476.90
  4. Step 4: Simplify right side
    719.09x = 514,283.57
  5. Step 5: Solve for x
    x = 514,283.57/719.09
  6. Step 6: Final answer
    x = 715.19

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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.