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Finding the Fourth Proportional to 719.19, 1,079.09 and 430.63

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Solution

The fourth proportional to 719.19, 1,079.09 and 430.63 is: 646.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.19 : 1,079.09 = 430.63 : x
  2. Step 2: Convert to fraction form
    719.19/1,079.09 = 430.63/x
  3. Step 3: Cross multiply
    719.19x = 1,079.09 × 430.63
  4. Step 4: Simplify right side
    719.19x = 464,688.53
  5. Step 5: Solve for x
    x = 464,688.53/719.19
  6. Step 6: Final answer
    x = 646.13

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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.