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Finding the Fourth Proportional to 784.91, 1,177.61 and 539.16

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Solution

The fourth proportional to 784.91, 1,177.61 and 539.16 is: 808.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.91 : 1,177.61 = 539.16 : x
  2. Step 2: Convert to fraction form
    784.91/1,177.61 = 539.16/x
  3. Step 3: Cross multiply
    784.91x = 1,177.61 × 539.16
  4. Step 4: Simplify right side
    784.91x = 634,917.51
  5. Step 5: Solve for x
    x = 634,917.51/784.91
  6. Step 6: Final answer
    x = 808.91

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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.