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Finding the Fourth Proportional to 1,407.98, 2,111.97 and 434.16

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Solution

The fourth proportional to 1,407.98, 2,111.97 and 434.16 is: 651.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.98 : 2,111.97 = 434.16 : x
  2. Step 2: Convert to fraction form
    1,407.98/2,111.97 = 434.16/x
  3. Step 3: Cross multiply
    1,407.98x = 2,111.97 × 434.16
  4. Step 4: Simplify right side
    1,407.98x = 916,934.52
  5. Step 5: Solve for x
    x = 916,934.52/1,407.98
  6. Step 6: Final answer
    x = 651.24

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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.