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Finding the Fourth Proportional to 1,407.88, 2,111.22 and 433.72

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Solution

The fourth proportional to 1,407.88, 2,111.22 and 433.72 is: 650.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.88 : 2,111.22 = 433.72 : x
  2. Step 2: Convert to fraction form
    1,407.88/2,111.22 = 433.72/x
  3. Step 3: Cross multiply
    1,407.88x = 2,111.22 × 433.72
  4. Step 4: Simplify right side
    1,407.88x = 915,678.34
  5. Step 5: Solve for x
    x = 915,678.34/1,407.88
  6. Step 6: Final answer
    x = 650.40

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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.