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Finding the Fourth Proportional to 1,391.28, 2,085.60 and 525

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Solution

The fourth proportional to 1,391.28, 2,085.60 and 525 is: 787.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.28 : 2,085.60 = 525 : x
  2. Step 2: Convert to fraction form
    1,391.28/2,085.60 = 525/x
  3. Step 3: Cross multiply
    1,391.28x = 2,085.60 × 525
  4. Step 4: Simplify right side
    1,391.28x = 1,094,940
  5. Step 5: Solve for x
    x = 1,094,940/1,391.28
  6. Step 6: Final answer
    x = 787.00

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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.