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Finding the Fourth Proportional to 719.59, 1,079.15 and 477.40

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Solution

The fourth proportional to 719.59, 1,079.15 and 477.40 is: 715.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.59 : 1,079.15 = 477.40 : x
  2. Step 2: Convert to fraction form
    719.59/1,079.15 = 477.40/x
  3. Step 3: Cross multiply
    719.59x = 1,079.15 × 477.40
  4. Step 4: Simplify right side
    719.59x = 515,180.81
  5. Step 5: Solve for x
    x = 515,180.81/719.59
  6. Step 6: Final answer
    x = 715.94

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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.