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Finding the Fourth Proportional to 1,390.57, 2,086.77 and 524.89

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Solution

The fourth proportional to 1,390.57, 2,086.77 and 524.89 is: 787.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.57 : 2,086.77 = 524.89 : x
  2. Step 2: Convert to fraction form
    1,390.57/2,086.77 = 524.89/x
  3. Step 3: Cross multiply
    1,390.57x = 2,086.77 × 524.89
  4. Step 4: Simplify right side
    1,390.57x = 1,095,324.71
  5. Step 5: Solve for x
    x = 1,095,324.71/1,390.57
  6. Step 6: Final answer
    x = 787.68

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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.