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Finding the Fourth Proportional to 877.68, 1,317.20 and 415.68

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Solution

The fourth proportional to 877.68, 1,317.20 and 415.68 is: 623.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.68 : 1,317.20 = 415.68 : x
  2. Step 2: Convert to fraction form
    877.68/1,317.20 = 415.68/x
  3. Step 3: Cross multiply
    877.68x = 1,317.20 × 415.68
  4. Step 4: Simplify right side
    877.68x = 547,533.70
  5. Step 5: Solve for x
    x = 547,533.70/877.68
  6. Step 6: Final answer
    x = 623.84

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1.5x scale

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.