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Finding the Fourth Proportional to 987.95, 1,364.45 and 657.77

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Solution

The fourth proportional to 987.95, 1,364.45 and 657.77 is: 908.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.95 : 1,364.45 = 657.77 : x
  2. Step 2: Convert to fraction form
    987.95/1,364.45 = 657.77/x
  3. Step 3: Cross multiply
    987.95x = 1,364.45 × 657.77
  4. Step 4: Simplify right side
    987.95x = 897,491.84
  5. Step 5: Solve for x
    x = 897,491.84/987.95
  6. Step 6: Final answer
    x = 908.44

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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.