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Finding the Fourth Proportional to 915.42, 1,264.38 and 666.36

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Solution

The fourth proportional to 915.42, 1,264.38 and 666.36 is: 920.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.42 : 1,264.38 = 666.36 : x
  2. Step 2: Convert to fraction form
    915.42/1,264.38 = 666.36/x
  3. Step 3: Cross multiply
    915.42x = 1,264.38 × 666.36
  4. Step 4: Simplify right side
    915.42x = 842,532.26
  5. Step 5: Solve for x
    x = 842,532.26/915.42
  6. Step 6: Final answer
    x = 920.38

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Double scale
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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.