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Finding the Fourth Proportional to 619.72, 856.14 and 407.54

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Solution

The fourth proportional to 619.72, 856.14 and 407.54 is: 563.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.72 : 856.14 = 407.54 : x
  2. Step 2: Convert to fraction form
    619.72/856.14 = 407.54/x
  3. Step 3: Cross multiply
    619.72x = 856.14 × 407.54
  4. Step 4: Simplify right side
    619.72x = 348,904.98
  5. Step 5: Solve for x
    x = 348,904.98/619.72
  6. Step 6: Final answer
    x = 563.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.