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Finding the Fourth Proportional to 921.48, 1,270.76 and 711.32

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Solution

The fourth proportional to 921.48, 1,270.76 and 711.32 is: 980.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.48 : 1,270.76 = 711.32 : x
  2. Step 2: Convert to fraction form
    921.48/1,270.76 = 711.32/x
  3. Step 3: Cross multiply
    921.48x = 1,270.76 × 711.32
  4. Step 4: Simplify right side
    921.48x = 903,917.00
  5. Step 5: Solve for x
    x = 903,917.00/921.48
  6. Step 6: Final answer
    x = 980.94

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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.