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Finding the Fourth Proportional to 1,407.57, 2,111.36 and 433.74

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Solution

The fourth proportional to 1,407.57, 2,111.36 and 433.74 is: 650.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.57 : 2,111.36 = 433.74 : x
  2. Step 2: Convert to fraction form
    1,407.57/2,111.36 = 433.74/x
  3. Step 3: Cross multiply
    1,407.57x = 2,111.36 × 433.74
  4. Step 4: Simplify right side
    1,407.57x = 915,779.12
  5. Step 5: Solve for x
    x = 915,779.12/1,407.57
  6. Step 6: Final answer
    x = 650.61

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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.