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Finding the Fourth Proportional to 784.24, 1,083.56 and 619.72

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Solution

The fourth proportional to 784.24, 1,083.56 and 619.72 is: 856.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.24 : 1,083.56 = 619.72 : x
  2. Step 2: Convert to fraction form
    784.24/1,083.56 = 619.72/x
  3. Step 3: Cross multiply
    784.24x = 1,083.56 × 619.72
  4. Step 4: Simplify right side
    784.24x = 671,498.00
  5. Step 5: Solve for x
    x = 671,498.00/784.24
  6. Step 6: Final answer
    x = 856.24

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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.