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Finding the Fourth Proportional to 1,264.08, 1,747.08 and 915.60

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Solution

The fourth proportional to 1,264.08, 1,747.08 and 915.60 is: 1,265.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.08 : 1,747.08 = 915.60 : x
  2. Step 2: Convert to fraction form
    1,264.08/1,747.08 = 915.60/x
  3. Step 3: Cross multiply
    1,264.08x = 1,747.08 × 915.60
  4. Step 4: Simplify right side
    1,264.08x = 1,599,626.45
  5. Step 5: Solve for x
    x = 1,599,626.45/1,264.08
  6. Step 6: Final answer
    x = 1,265.45

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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.