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Finding the Fourth Proportional to 921.32, 1,270.75 and 686.07

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Solution

The fourth proportional to 921.32, 1,270.75 and 686.07 is: 946.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.32 : 1,270.75 = 686.07 : x
  2. Step 2: Convert to fraction form
    921.32/1,270.75 = 686.07/x
  3. Step 3: Cross multiply
    921.32x = 1,270.75 × 686.07
  4. Step 4: Simplify right side
    921.32x = 871,813.67
  5. Step 5: Solve for x
    x = 871,813.67/921.32
  6. Step 6: Final answer
    x = 946.27

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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.