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Finding the Fourth Proportional to 661.76, 990.84 and 525.68

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Solution

The fourth proportional to 661.76, 990.84 and 525.68 is: 787.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.76 : 990.84 = 525.68 : x
  2. Step 2: Convert to fraction form
    661.76/990.84 = 525.68/x
  3. Step 3: Cross multiply
    661.76x = 990.84 × 525.68
  4. Step 4: Simplify right side
    661.76x = 520,864.77
  5. Step 5: Solve for x
    x = 520,864.77/661.76
  6. Step 6: Final answer
    x = 787.09

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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.