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Finding the Fourth Proportional to 1,407.91, 2,111.87 and 434.02

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Solution

The fourth proportional to 1,407.91, 2,111.87 and 434.02 is: 651.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.91 : 2,111.87 = 434.02 : x
  2. Step 2: Convert to fraction form
    1,407.91/2,111.87 = 434.02/x
  3. Step 3: Cross multiply
    1,407.91x = 2,111.87 × 434.02
  4. Step 4: Simplify right side
    1,407.91x = 916,593.82
  5. Step 5: Solve for x
    x = 916,593.82/1,407.91
  6. Step 6: Final answer
    x = 651.03

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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.