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Finding the Fourth Proportional to 877.28, 1,315.35 and 414.45

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Solution

The fourth proportional to 877.28, 1,315.35 and 414.45 is: 621.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.28 : 1,315.35 = 414.45 : x
  2. Step 2: Convert to fraction form
    877.28/1,315.35 = 414.45/x
  3. Step 3: Cross multiply
    877.28x = 1,315.35 × 414.45
  4. Step 4: Simplify right side
    877.28x = 545,146.81
  5. Step 5: Solve for x
    x = 545,146.81/877.28
  6. Step 6: Final answer
    x = 621.41

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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.