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Finding the Fourth Proportional to 783.69, 1,081.56 and 586.86

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Solution

The fourth proportional to 783.69, 1,081.56 and 586.86 is: 809.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.69 : 1,081.56 = 586.86 : x
  2. Step 2: Convert to fraction form
    783.69/1,081.56 = 586.86/x
  3. Step 3: Cross multiply
    783.69x = 1,081.56 × 586.86
  4. Step 4: Simplify right side
    783.69x = 634,724.30
  5. Step 5: Solve for x
    x = 634,724.30/783.69
  6. Step 6: Final answer
    x = 809.92

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1.5x scale

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.