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Finding the Fourth Proportional to 877.76, 1,315.20 and 620

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Solution

The fourth proportional to 877.76, 1,315.20 and 620 is: 928.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.76 : 1,315.20 = 620 : x
  2. Step 2: Convert to fraction form
    877.76/1,315.20 = 620/x
  3. Step 3: Cross multiply
    877.76x = 1,315.20 × 620
  4. Step 4: Simplify right side
    877.76x = 815,424
  5. Step 5: Solve for x
    x = 815,424/877.76
  6. Step 6: Final answer
    x = 928.98

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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.