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Finding the Fourth Proportional to 1,313.21, 1,813.08 and 915.71

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Solution

The fourth proportional to 1,313.21, 1,813.08 and 915.71 is: 1,264.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.21 : 1,813.08 = 915.71 : x
  2. Step 2: Convert to fraction form
    1,313.21/1,813.08 = 915.71/x
  3. Step 3: Cross multiply
    1,313.21x = 1,813.08 × 915.71
  4. Step 4: Simplify right side
    1,313.21x = 1,660,255.49
  5. Step 5: Solve for x
    x = 1,660,255.49/1,313.21
  6. Step 6: Final answer
    x = 1,264.27

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1.5x scale

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.