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Finding the Fourth Proportional to 921.40, 1,270.56 and 655.72

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Solution

The fourth proportional to 921.40, 1,270.56 and 655.72 is: 904.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.40 : 1,270.56 = 655.72 : x
  2. Step 2: Convert to fraction form
    921.40/1,270.56 = 655.72/x
  3. Step 3: Cross multiply
    921.40x = 1,270.56 × 655.72
  4. Step 4: Simplify right side
    921.40x = 833,131.60
  5. Step 5: Solve for x
    x = 833,131.60/921.40
  6. Step 6: Final answer
    x = 904.20

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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.