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Finding the Fourth Proportional to 917.76, 1,267.08 and 637.90

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Solution

The fourth proportional to 917.76, 1,267.08 and 637.90 is: 880.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,267.08 = 637.90 : x
  2. Step 2: Convert to fraction form
    917.76/1,267.08 = 637.90/x
  3. Step 3: Cross multiply
    917.76x = 1,267.08 × 637.90
  4. Step 4: Simplify right side
    917.76x = 808,270.33
  5. Step 5: Solve for x
    x = 808,270.33/917.76
  6. Step 6: Final answer
    x = 880.70

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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.