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Finding the Fourth Proportional to 1,313.66, 1,813.73 and 915.21

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Solution

The fourth proportional to 1,313.66, 1,813.73 and 915.21 is: 1,263.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.66 : 1,813.73 = 915.21 : x
  2. Step 2: Convert to fraction form
    1,313.66/1,813.73 = 915.21/x
  3. Step 3: Cross multiply
    1,313.66x = 1,813.73 × 915.21
  4. Step 4: Simplify right side
    1,313.66x = 1,659,939.26
  5. Step 5: Solve for x
    x = 1,659,939.26/1,313.66
  6. Step 6: Final answer
    x = 1,263.60

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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.