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Finding the Fourth Proportional to 1,406.70, 2,109.87 and 432.81

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Solution

The fourth proportional to 1,406.70, 2,109.87 and 432.81 is: 649.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.70 : 2,109.87 = 432.81 : x
  2. Step 2: Convert to fraction form
    1,406.70/2,109.87 = 432.81/x
  3. Step 3: Cross multiply
    1,406.70x = 2,109.87 × 432.81
  4. Step 4: Simplify right side
    1,406.70x = 913,172.83
  5. Step 5: Solve for x
    x = 913,172.83/1,406.70
  6. Step 6: Final answer
    x = 649.16

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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.