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Finding the Fourth Proportional to 877.82, 1,316.72 and 391

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Solution

The fourth proportional to 877.82, 1,316.72 and 391 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.82 : 1,316.72 = 391 : x
  2. Step 2: Convert to fraction form
    877.82/1,316.72 = 391/x
  3. Step 3: Cross multiply
    877.82x = 1,316.72 × 391
  4. Step 4: Simplify right side
    877.82x = 514,837.52
  5. Step 5: Solve for x
    x = 514,837.52/877.82
  6. Step 6: Final answer
    x = 586.50

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Similar ratio
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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.