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Finding the Fourth Proportional to 1,407.87, 2,111.55 and 433.76

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Solution

The fourth proportional to 1,407.87, 2,111.55 and 433.76 is: 650.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.87 : 2,111.55 = 433.76 : x
  2. Step 2: Convert to fraction form
    1,407.87/2,111.55 = 433.76/x
  3. Step 3: Cross multiply
    1,407.87x = 2,111.55 × 433.76
  4. Step 4: Simplify right side
    1,407.87x = 915,895.37
  5. Step 5: Solve for x
    x = 915,895.37/1,407.87
  6. Step 6: Final answer
    x = 650.55

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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.