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Finding the Fourth Proportional to 921.59, 1,272.30 and 711.30

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Solution

The fourth proportional to 921.59, 1,272.30 and 711.30 is: 981.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.59 : 1,272.30 = 711.30 : x
  2. Step 2: Convert to fraction form
    921.59/1,272.30 = 711.30/x
  3. Step 3: Cross multiply
    921.59x = 1,272.30 × 711.30
  4. Step 4: Simplify right side
    921.59x = 904,986.99
  5. Step 5: Solve for x
    x = 904,986.99/921.59
  6. Step 6: Final answer
    x = 981.99

Related Problems

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Half scale
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Double scale
Find fourth proportional to 922.59, 1,273.68 and 712.30
Similar ratio
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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.