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Finding the Fourth Proportional to 787.59, 1,087.16 and 525.69

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Solution

The fourth proportional to 787.59, 1,087.16 and 525.69 is: 725.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.59 : 1,087.16 = 525.69 : x
  2. Step 2: Convert to fraction form
    787.59/1,087.16 = 525.69/x
  3. Step 3: Cross multiply
    787.59x = 1,087.16 × 525.69
  4. Step 4: Simplify right side
    787.59x = 571,506.51
  5. Step 5: Solve for x
    x = 571,506.51/787.59
  6. Step 6: Final answer
    x = 725.64

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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.